
580 P.2d 1012 (1978)
282 Or. 625
SEATTLE-FIRST NATIONAL BANK, a National Banking Association, Appellant,
v.
Ronald W. SCHRIBER, Individually and the Marital Community of Ronald W. Schriber and Peggy L. Schriber, Husband and Wife, Respondents.
TC A7604-05594; SC 25451.
Supreme Court of Oregon, Department 1.
Argued and Submitted April 6, 1978.
Decided June 20, 1978.
Charles Robinowitz, Portland, argued the cause for appellant. With him on the briefs was Robert D. Dames, Jr., Portland.
Michael V. Reed, Portland, argued the cause for respondents. With him on the brief were Norman Wapnick and Sussman, Shank, Wapnick & Caplan.
Before DENECKE, C.J., and HOLMAN, HOWELL, and LENT, JJ.
LENT, Judge.
On April 21, 1976, plaintiff, a national bank, filed this action to recover the unpaid balance on a promissory note. Plaintiff alleged that defendant on December 15, 1969, had executed and delivered the note reproduced immediately below in favor of the plaintiff.

Defendant, pursuant to ORS 16.260(7),[1] demurred to the complaint for the reason that the action was not commenced within the six-year period of the governing statute *1013 of limitations, ORS 12.080.[2] The trial court sustained defendant's demurrer. Plaintiff declined to plead over, and judgment was given for defendant. Plaintiff appeals, assigning this ruling as error.
The sole issue in this case is whether the note in question is a demand note as a matter of law. We hold it is not and reverse.
The importance of this characterization is the different treatment given demand and time notes by the Uniform Commercial Code, ORS ch. 73 (and the "generally accepted rule" before that), with regard to the accrual of causes of action against the maker. ORS 73.1220 provides:
"(1) A cause of action against a maker * * * accrues
"(a) In the case of a time instrument on the day after maturity;
"(b) In the case of a demand instrument upon its date or, if no date is stated, on the date of issue."[3]
Thus, if the note is a demand instrument, as defendant asserts and as the trial court obviously held, the cause of action accrued (and therefore the statute of limitations began to run, ORS 12.010)[4] on December 15, 1969, and the action, filed more than six years after that date, is time barred. If the note is not a demand note but a time instrument, the cause of action accrued on the day after its maturity, on June 14, 1970, which is within six years of the filing date.
We look to the definition of demand instrument, which we take to be synonymous with "instrument payable on demand."
ORS 73.1080 provides:
"Instruments payable on demand include those payable at sight or on presentation and those in which no time for payment is stated."
The drafters obviously felt no need to state the obvious, that demand instruments also include instruments made expressly payable "on demand." See 2 Anderson Uniform Commercial Code, § 3-108:4 (1971).
The "on demand" language in the time term of the note indicates an intention that the note should be payable on demand; however, the addition of the words "but no later than 180 days" creates an ambiguity not susceptible to resolution as a matter of law.[5]
The trial court erred in sustaining defendant's demurrer. The judgment is reversed, and the case is remanded.
NOTES
[1]  ORS 16.260 provides, in pertinent part:

"The defendant may demur to the complaint within the time required by law to appear and answer, when it appears upon the face thereof:
"* * *
"(7) That the action has not been commenced within the time limited by statute."
[2]  ORS 12.080 provides, in pertinent part:

"(1) An action upon a contract or liability, express or implied, excepting those mentioned in ORS 12.070 and 12.110 and except as otherwise provided in ORS 72.7250 * * shall be commenced within six years."
[3]  But see Bank of Nevada v. United States, 251 F.2d 820, 827 (9th Cir.1957), cert. den. 356 U.S. 938, 78 S.Ct. 780, 2 L.Ed.2d 813, quoting from Sullivan v. Ellis, 219 F. 694, 696 (8th Cir.1915), as follows:

"The general rule with regard to commercial paper, payable on demand, is that it becomes due immediately, and that the statute of limitations begins to run from its date.
"`This rule may not apply when there is something on the paper or in the circumstances under which it is given, showing that it was not the intent that it should become due immediately.'" [citation omitted]
[4]  ORS 12.010 provides:

"Actions at law shall only be commenced within the periods prescribed in this chapter, after the cause of action shall have accrued, except where a different limitation is prescribed by statute. The objection that the action was not commenced within the time limited shall only be taken by answer, except as provided in ORS 16.260."
[5]  The parties argued strenuously about the effect of the marginal notation "DUE 6-13-70," which date is 180 days after the date of the note, December 15, 1969. Actually there are two separate issues involved:

(1) Whether this marginal notation constitutes part of the time term of the note itself; and
(2) Whether evidence of this marginal notation is admissible as parol evidence to explain the intrinsic ambiguity in the note.
Neither issue requires resolution here. With reference to the first issue, however, we note the exhaustive treatment given in Anno: Writing on the margin or on the back of a bill or note at the time of its execution as a part thereof, 13 A.L.R. 251 (1921), supplemented by 155 A.L.R. 218 (1945), and cases cited therein, especially In Re Feldman, 387 Ill. 568, 56 N.E.2d 405, 155 A.L.R. 210 (1944). With reference to the second issue, we note the statutory parol evidence rule, ORS 41.740.
