
596 F.Supp.2d 538 (2009)
UNITED STATES of America, Plaintiff,
v.
Emil THOMPSON, Defendant.
Case No. 06-CV-6341(FB)(VVP).
United States District Court, E.D. New York.
January 8, 2009.
*540 Lisa L. Bellamy, Esq., U.S. Department of Justice Tax Division, Civil Trial Section, Northern Region, Washington, DC, for Plaintiff.
Daniel C. Marotta, Esq., Gabor & Marotta, Staten Island, NY, for Defendant.

MEMORANDUM AND ORDER
BLOCK, Senior District Judge:
Before the Court are the Report and Recommendation ("R & R") of Magistrate Judge Victor V. Pohorelsky and the objections thereto by the defendant, Emil Thompson ("Thompson"). For the reasons described below, the Court rejects Thompson's objections and accepts the R & R in its entirety.

I
On or about September 11, 1995, a delegate of the Secretary of the Treasury assessed a penalty of $82,383.20 against Thompson, as a statutorily "responsible person" who willfully failed to collect, truthfully account for, or pay over the withholding taxes of the employees of EJT Construction & Excavation Co. See 26 U.S.C. § 6672.
On February 24, 2004, the IRS received a compromise offer from Thompson in the amount of $500. On December 15, 2004, the IRS mailed Thompson a letter stating that his "offered amount of $500 cannot be recommended for acceptance[,]" inviting him to increase or withdraw his offer, and advising him that he would "receive separate notification with [his] right to appeal" in the event of his offer's ultimate rejection. Docket Entry # 19, Ex. 2.[1] The complaint alleges that Thompson's offer-in-compromise "was pending" through May 14, 2005, see Compl. ¶ 3 & n. 1; consistent with this allegation, internal IRS records state that Thompson's offer was "rejected" on May 14, 2005. See Pls'. Opp. to Request to Dismiss (Docket Entry # 8), Ex. 1.
Subsequently, the IRS referred the assessed penalty and interest thereon to the Department of Justice for collection. On November 29, 2006, the United States brought a civil action to recover the unpaid penalty assessed against Thompson, plus interest and costs of litigation. As a result of Thompson's failure to answer or otherwise defend, a default judgment was entered *541 on November 30, 2007, 2007 WL 4276862, and the matter was referred to Magistrate Judge Pohorelsky for a determination of the relief to be awarded. See Docket Entry # 21 (Memorandum and Order).
On November 21, 2008, the magistrate judge issued the R & R at issue, see Docket Entry # 33, recommending that the United States be awarded: (1) $148,716.50, reflecting the initially assessed penalty plus interest accrued through February 12, 2008, reduced by $55,550.00 in proceeds from the forced sale of Thompson's real estate, which occurred on that date; (2) interest upon this amount, accruing pursuant to 26 U.S.C. § 6621, calculated from February 12, 2008 until payment is made; and (3) taxable costs of this action, as submitted by the United States to the Clerk of the Court within 30 days after entry of final judgment. The R & R advised that "[a]ny objections ... must be filed with the Clerk of the Court ... within ten (10) days of receipt .... Failure to file objections within the specified time waives the right to appeal any judgment or order entered by the District Court ...." R & R at 546 (citations omitted). Thompson timely filed objections to the R & R. See Docket Entry #34.

II
"[A] district court evaluating a magistrate judge's recommendation is permitted to adopt those portions of the recommendation to which no specific, written objection is made, as long as those sections are not clearly erroneous." Greene v. WCI Holdings Corp., 956 F.Supp. 509, 513 (S.D.N.Y.1997) (internal quotation marks and citations omitted).
By contrast, "[s]hould either party object to the magistrate's recommendation,... `[the district court] shall make a de novo determination of those portions of the report or specified proposed findings or recommendations to which objection is made.'" Grassia v. Scully, 892 F.2d 16, 19 (2d Cir.1989) (quoting 28 U.S.C. § 636(b)(1)(B)). Even when exercising de novo review, however, "[t]he district court need not ... specifically articulate its reasons for rejecting a party's objections...." Morris v. Local 804, Int'l Bhd. of Teamsters, 167 Fed.Appx. 230, 232 (2d Cir. 2006). The district court "may accept, reject, or modify, in whole or in part, the findings or recommendations made by the magistrate. The judge may also receive further evidence or recommit the matter to the magistrate with instructions." Grassia, 892 F.2d at 19 (quoting 28 U.S.C. § 636(b)(1)).

III
In his R & R, the magistrate judge performed a fairly straightforward mathematical calculation of damages, based on liquidated sums and dates alleged in the complaint and the relevant interest rates imposed by statute. In his objections, Thompson does not take issue with the methodology of the R & R's damage calculations; rather, Thompson's principal objection is that the United States "failed to introduce any admissible evidence demonstrating that a rejection of [Thompson's offer-in-compromise] was in fact sent on May [14], 2005." Thompson Objection to R & R at 543. Thompson correctly notes that the United States "never, provided [the Court with] a copy of the letter it claims was sent on May 14, 2005 rejecting the offer[,]" and claims that he never received any such letter. Id. at 544. Thompson points out that under applicable regulations, "any offer-in-compromise ... shall be deemed to be accepted ... if such offer is not rejected ... before the date which is 24 months after the date of the *542 submission of such offer"in this case, February 24, 2006. 26 U.S.C. § 7122(f). Consequently, he argues, his offer should be deemed accepted, and the United States's recovery should be limited to the proposed compromise sum of $500.
"It is, of course, ancient learning that a default judgment deems all the wellpleaded allegations in the pleadings to be admitted[,]" Transatlantic Marine Claims Agency, Inc. v. Ace Shipping Corp., 109 F.3d 105, 108 (2d Cir.1997), except as to damage amounts that, unlike those in this case, are not liquidated or susceptible of mathematical computation. Flaks v. Koegel, 504 F.2d 702, 707 (2d Cir.1974); see also Greyhound Exhibitgroup, Inc. v. E.L.U.L. Realty Corp., 973 F.2d 155, 158 (2d Cir.1992). The United States's complaint alleges that Thompson's offer-incompromise was pending "through May 14, 2005"i.e., that the offer ceased to be pending on that date. Compl. ¶ 3 n. 1. This is logically equivalent to an allegation that the offer was duly rejected on that date. Because of Thompson's default, this factual allegation is deemed admitted; he cannot belatedly contest it in response to the magistrate judge's calculation of damages.
While this is a sufficient ground to deny Thompson's objection, the record also contains documentary evidence supporting the United States's allegation that Thompson's offer was in fact rejectednamely, the United States has submitted a printout of Thompson's IRS case history, which states that Thompson's offer was "rejected" on May 14, 2005. See Docket Entry 8, Ex. 1. While Thompson faults the United States for failing to submit the rejection letter itself, the business record submitted by the IRS is clearly sufficient circumstantial evidence from which to conclude that such a letter was sent on the date indicated therein.
Finally, Thompson's belated allegation that he never actually received the IRS's rejection letter is entirely immaterial, as "[r]ejection [of an offer-in-compromise] is effective as of the date on the rejection letter[,]" not as of the date it is received. Rev. Proc. 2003-71 § 9.01, 2003 WL 21982210 (I.R.S. Aug. 21, 2003); see also Notice 2006-68, 2006 WL 1891573 (I.R.S. July 11, 2006) ("The date an offer is rejected ... is the date on which the Service issues a written notice of rejection....") (emphasis added).[2]

CONCLUSION
Thompson's objections are denied, and the Court adopts the R & R in its entirety. Accordingly, the Court holds Thompson liable for the combined sum of (1) $148,716.50; (2) interest upon this amount, accruing pursuant to 26 U.S.C. § 6621, calculated from February 12, 2008 until the date of payment;[3] and (3) taxable *543 costs of this action, as submitted by the United States to the Clerk of the Court within 30 days after entry of final judgment, in accordance with Local Civil Rule 54.1 and 28 U.S.C. §§ 1920 and 1924.
SO ORDERED.

REPORT AND RECOMMENDATION
POHORELSKY, United States Magistrate Judge:
This matter was referred by the Honorable Frederic Block to the undersigned for a Report and Recommendation, pursuant to 28 U.S.C. § 636(b)(1), regarding the amount of damages, including unpaid trust fund recovery penalty, interest, and costs, to be awarded to the plaintiff, the United States, as against the defaulting defendant, Emil Thompson. The defendant was responsible under the Internal Revenue Code to pay withholding taxes with respect to employees of EJT Construction and Excavation Company ("EJT"). The defendant has opposed the damages sought by restating his statute of limitations and estoppel defenses to the underlying claim, without addressing the issues of damages and the amounts owed.[1] For the reasons below, the undersigned respectfully recommends that damages be awarded to the government in the amounts set forth below.

BACKGROUND
On September 11, 1995, a delegate of the Secretary of the Treasury made an assessment against the defendant, pursuant to 26 U.S.C. § 6672, for an unpaid trust fund recovery penalty in the amount of $82,383.20. (Compl. ¶ 3.) As a result, a delegate of the Secretary of the Treasury gave notice to the defendant of the assessment, and made a demand for payment of the assessed penalty. (Compl. ¶ 4.) The parties began to negotiate, and the IRS received a compromise offer of $500 from the defendant on February 24, 2004. (Ans. to Pls. Mot. to Vac. Misc. Order of Sep. 4, 2007, Dkt. Entry 20, Attach. 1.) This offer in compromise was pending for 325 days, until May 14, 2005, when it was rejected by the IRS. (Id.) Subsequently, the defendant failed to pay the assessed penalty. As of November 29, 2006, the assessed accrued interest on the penalty was $103,215.47, resulting in total liability of $185,598.67. (Compl. ¶ 5.) The IRS referred the penalty and interest to the Department of Justice for tax collection. On February 12, 2008 the defendant's total liability was reduced by $55,550.00, due to the application of a payment representing the proceeds from the sale of the defendant's interest in real property located at 4 Benet Drive, Morganville, New Jersey. (United States's Suppl. Mem. of Law in Supp. of Damages, Dkt. Entry 32, 1.) The government asserts that as of February 12, 2008 the defendant's total liability, including interest, was $148,716.50, and that interest continues to accrue until payment is made. (Id.) Additionally, the government seeks to recover the costs of this action.

DISCUSSION
The government's submissions have established that the defendant is liable for *544 his failure to pay EJT's employee taxes. The issue posed by the government's instant motion is the amount of the penalty, interest, and costs to be awarded.

I. AMOUNT OF PENALTY

As to the principal penalty of $82,383.20, the government has provided sufficient support to show the defendant incurred such a penalty pursuant to 26 U.S.C. § 6672. Assessments made by the IRS are "presumed to be correct and it is the taxpayer who must rebut this presumption." Curley v. United States, 791 F.Supp. 52, 54 (E.D.N.Y.1992); see also United States v. Schroeder, 900 F.2d 1144, 1148 (7th Cir.1990); Ruth v. United States, 823 F.2d 1091, 1093 (7th Cir.1987). "In general, courts will not look behind an assessment to evaluate the procedure and evidence used" so long as the assessment is not shown to be "without rational foundation or arbitrary and erroneous." Ruth, 823 F.2d at 1094. The presumption may also be overcome "by a showing that the assessment was computed in an incorrect manner." Schroeder, 900 F.2d at 1147. As the defendant has not presented the court with any evidence pertaining to the amount of the assessed penalty, and has made no allegations that the assessment was calculated incorrectly or arbitrarily, the presumption that the amount is correct has not been defeated.

II. INTEREST

There is also a clear statutory basis for an award of interest on the penalty. Interest on a penalty imposed pursuant to 26 U.S.C. § 6672 accrues by operation of statute. See Schroeder, 900 F.2d at 1150; United States v. Mazzeo, 306 F.Supp.2d 294 (E.D.N.Y.2004); see also 26 U.S.C. §§ 6601(e)(2), 6621; 28 U.S.C. § 1961(c)(1). Under 26 U.S.C. § 6601(e)(2), interest on penalties "shall be imposed ... from the date of the notice and demand." The rate of interest on a 26 U.S.C. § 6672 penalty is the sum of "the Federal short-term rate ... plus ... 3 percentage points," determined quarterly. 26 U.S.C. § 6621(a)(2)(A), (B). This adjusted rate is "published by the Commissioner in a Revenue Ruling" and "accrues at the prescribed rate per annum compounded daily." 26 C.F.R. 301.6621-1; see also 26 C.F.R. 301.6622-1.
As notice and demand for payment here was made on September 11, 1995, the government asserts that interest accrued on the penalty from that date. Although the government has provided figures for total amounts of interest that they contend are due, they have not enclosed any chart reflecting the computations that reach those amounts or any other explanation for how the amounts were calculated. While "the amount [of interest] owed is a matter of law, not of evidence," and "is not something the government must prove," Schroeder, 900 F.2d at 1150, the court must nevertheless make findings that a factual basis for an award of damages exists. This requires some evaluation as to whether the assertions concerning the amount of interest are reasonably accurate computations taking into account the effective interest rates and the principal balance on which the interest rates are imposed.
The court has therefore done its own calculations to test the validity of the government's assertions concerning accrued interest. For the period from September 11, 1995 until November 29, 2006 the government contends the accrued interest totaled $103,215.47. (Randle Aff. of Debt, May 29, 2007, annexed to Pl. Mot. for *545 Entry of Def. Judg., ¶ 3.). A review of Revenue Ruling 2008-47, which details the rates at which interest on this penalty should accrue, reveals that interest on tax underpayments ran at the highest rates in the years immediately following assessment of the penalty, alternating between 8% and 9% from September 1995 until January 1, 1999, at which point the rate dropped to 7% for one quarter. On April 1, 1999 the rate was set and stayed at 8% until the following year, when on April 1, 2000, the rate again climbed to 9%. Following this high mark, the rates were lower in the subsequent years, dropping to 4% in 2004, before jumping again to 8% in the quarter preceding November 29, 2006. If the interest on the defendant's initial penalty is calculated at a consistent rate of 6%, compounded daily, the total amount of interest owed after eleven years[2] would have been $77,002.15. Interest accruing at a rate of 7% a year, compounded daily, amounts to $95,530.80 after eleven years. If the interest is calculated at a rate of 8%, compounded daily, the total amount of interest owed after eleven years would be $116,214.79. Interest accruing at 9% per annum after eleven years would be $139,301.71. These rough calculations of interest that would accrue at various interest rates demonstrates to the court's satisfactions that the government's assessment of $103,215.47 as the interest that accrued during the period in question is consistent with 26 U.S.C. § 6621 and the rates set forth by the Commissioner. Similarly, for the period from November 29, 2006 to February 12, 2008, during most of which the applicable interest rate was 8% per annum, the interest calculation by the government is consistent with the prescribed rates.[3]
The total amount owed to the IRS will only become known when the defendant pays his debt in full, as 26 U.S.C. § 6601(e)(2) further provides that interest on penalties accrues until "the date of payment." Thus an award for further interest on the $148,716.50, accruing at the rates determined by sections 6621 and 1961(c)(1) from February 12, 2008 until payment is made in full, is appropriate here as well.

III. COSTS

Finally, the government seeks to recover the costs of this action. Costs should be allowed to the prevailing party in a civil action, and it is well established that the United States may recover costs in civil actions as if it were a private individual. FED. R. CIV. P. 54(d)(1); Pine River Logging & Imp. Co. v. United States, 186 U.S. 279, 22 S.Ct. 920, 46 L.Ed. 1164 (1902). The government shall, within 30 days after the entry of final judgment, file "a request to tax costs annexing a bill of costs" with the clerk, who will "proceed to tax costs at the time noticed and allow such items as are properly taxable." LOCAL CIV. R. 54.1; 28 U.S.C. § 1920. Such a bill must be accompanied by an affidavit *546 made by the prevailing party, asserting that the items are correctly assessed, necessarily incurred, and actually and necessarily performed in the case. 28 U.S.C. § 1924; LOCAL CIV. R. 54.1(a). So long as the government follows proper procedure, costs should be awarded in this action.

CONCLUSION
For the foregoing reasons, the court respectfully recommends that the government be awarded: (1) a principal amount of $148,716.50 reflecting the initially assessed unpaid trust fund penalty plus interest accrued, reduced by the $55,550.00 sale of the defendant's real property interest; (2) interest upon the principal amount accruing pursuant to 26 U.S.C. § 6621 and 28 U.S.C. § 1961(c)(1), from February 12, 2008 until payment is made; and (3) taxable costs of this action, as submitted by the government to the clerk within 30 days after entry of final judgment.
Any objections to the Report and Recommendation above must be filed with the Clerk of the Court with a copy to the undersigned within 10 days of receipt of this report. Failure to file objections within the specified time waives the right to appeal any judgment or order entered by the District Court in reliance on this Report and Recommendation. 28 U.S.C. § 636(b)(1); Fed.R.Civ.P. 72(b); Thomas v. Arn, 474 U.S. 140, 155, 106 S.Ct. 466, 474, 88 L.Ed.2d 435 (1985); IUE AFCIO Pension Fund v. Herrmann, 9 F.3d 1049, 1054 (2d Cir.1993); Frank v. Johnson, 968 F.2d 298 (2d Cir.1992), cert. denied, 506 U.S. 1038, 113 S.Ct. 825, 121 L.Ed.2d 696 (1992); Small v. Secretary of Health and Human Serv., 892 F.2d 15, 16 (2d Cir.1989) (per curiam).
Respectfully submitted,
Dated: Brooklyn, New York
November 21, 2008
NOTES
[1]  This letter did not constitute an official rejection of the offer-in-compromise. See 26 C.F.R. § 301.7122-1 (f) ("An offer to compromise has not been rejected until the IRS issues a written notice to the taxpayer or his representative, advising of the rejection, the reason(s) for the rejection, and the right to an appeal.").
[2]  Generously construed, Thompson's objections also appear to take issue with the consistency of two affidavits submitted by the United States. One states that accrued interest as of November 29, 2006 was $103,215.47. See Aff. of Kim E. Randle (Docket Entry # 6) ¶ 4. The other states that after the application of the $55,550.00 in proceeds from the forced sale of Thompson's property on February 12, 2008, his total outstanding liability (including principal and interest) was $148,716.50. See Aff. of Marlene Sudano (Docket Entry # 33) ¶ 4. These two affidavits are not "based upon the same dates," as Thompson claims they are, Thompson Objection to R & R at 545; nor are they even calculations of the same quantity. That these numbers diverge, therefore, is entirely unremarkable.
[3]  The rate of interest on a penalty imposed pursuant to 26 U.S.C. § 6672 is the sum of "the Federal short-term rate ... plus ... 3 percentage points . . . ." 26 U.S.C. § 6621(a)(2); see also 28 U.S.C. § 1961(c)(1). The Federal short-term rate is determined by the Secretary of the Treasury for each calendar quarter, see 26 U.S.C. § 6621(b); 26 U.S.C. § 1274(d); it is "published by the Commissioner in a Revenue Ruling" and "accrues at the prescribed rate per annum compounded daily." 26 C.F.R. 301.6621-1; see also 26 C.F.R. 301.6622-1.
[1]  Judge Block considered and rejected these defenses when the defendant submitted an opposition to the government's motion for default judgment. (See November 30, 2007, 2007 WL 4276862, Memorandum and Order, Dkt. Entry 21.) As the defenses do not concern the calculation of damages, they need not be discussed again here.
[2]  Eleven years is the approximate amount of elapsed time between notice and demand for payment, made on September 11, 1995 and November 29, 2006, when the government filed their complaint.
[3]  As of November 29, 2006, the total liability was $185,598.67. After giving credit for the $55,550 by which the total liability was reduced on February 12, 2008, the government contends the total liability as of that date was $148,716.50, which means that an additional $18,667.83 in interest had accrued according to the government's calculations during the fourteen and a half months between November 29, 2006 and February 12, 2008. Interest on $185,598.67 compounded daily at 8% per annum for fourteen and a half months yields approximately $18,788.16.
