Tie-out tool / 9/80 and 4/10 schedules

Code TT on 9/80 and 4/10 schedules

It depends on where the workweek starts. On a 9/80 schedule a Sunday-start workweek has 44 hours every other week, which is 4 overtime hours. A workweek that starts midday on the 8-hour Friday has 40 hours every week and none.

9/80 schedule

Nine-hour days Monday to Thursday, an 8-hour Friday in week 1, Friday off in week 2: 80 hours in two weeks.

Workweek	Code TT	Hours worked	Overtime hours paid	Register overtime	Why
Calendar week 1, Sunday start (9, 9, 9, 9, 8)	$50.00	44	4	$150.00	4 hours over 40
Calendar week 2, Sunday start (9, 9, 9, 9, off)	$0.00	36	0	$0.00	Under 40
Week 1, workweek starts midday Friday	$0.00	40	0	$0.00	Friday is split 4 and 4
Week 2, workweek starts midday Friday	$0.00	40	0	$0.00	Under the standard

A workweek "may begin on any day of the week and at any hour of the day established by the employer." (IRS FS-2026-13, Q13) That is why employers on a 9/80 plan fix the start at the midpoint of the 8-hour Friday. Once fixed, it stays: the workweek is a fixed and regularly recurring period. (29 CFR 778.105)

4/10 schedule

Workweek	Code TT	Hours worked	Overtime hours paid	Register overtime	Why
Four 10-hour days	$0.00	40	0	$0.00	Not over 40
Four 10-hour days, daily overtime paid after 8	$0.00	40	8	$300.00	Premium paid, none of it over 40 worked
Four 10-hour days plus an 8-hour fifth day	$100.00	48	8	$300.00	8 hours over 40
Three 10-hour days plus a 10-hour holiday paid	$0.00	30	0	$0.00	Holiday hours are not worked

Rate $25 an hour in both tables. Daily overtime after 8 hours comes from state law or company policy, not the federal 40-hour rule, so its premium is not qualified overtime unless the hours are also over 40 worked in the week. (FS-2026-13, Q16) See state daily overtime.

What to check in the timesheet

The workweek start the employer actually set, including the hour. A timesheet export by calendar day cannot show a midday start; the split Friday has to be entered as two days or handled by hand.
Whether the register paid overtime in the 44-hour week. If the workweek is Sunday to Saturday and no overtime was paid, pay is short; an unpaid premium is not reported in Code TT.

Do the whole year from a file

Drop a timesheet CSV, paste the register overtime totals, and get a worksheet per employee with the reason for every difference.

Open the tie-out tool

Runs in your browser. Payroll data is never uploaded.

Questions

Does a 9/80 schedule create qualified overtime?

Not when the workweek is set to start midway through the 8-hour Friday, because each workweek then has 40 hours. With a Sunday or Monday start the long week has 44 hours and 4 overtime hours.

Are four 10-hour days overtime for Code TT?

No. Forty hours worked in the workweek is not over 40. Any daily overtime premium paid for the ninth and tenth hours is left out.

Sources

Fetched 2026-11-10. Regulation text was checked against the federal annual edition; links open the current online version.

Updated 2026-11-10. Tickfoot is an information tool, not tax, legal or professional advice.