Base period and high quarter: the wages behind your unemployment check
Every unemployment formula starts from a base period, usually a year of wages ending a few months before you file. Here is how to find yours and read the letter that lists it.
Unemployment in Texas
$480
a week, for up to 26 weeks · $12,480 in all
| Weekly benefit | $480 |
| Weeks payable | 26 weeks |
| Total if you stay unemployed | $12,480 |
| Federal income tax on it, about | $1,408 |
| 10% federal withholding, if you ask (W-4V) | $48 a week |
| State income tax on it | check your state |
| Your take-home pay now, a week | $784 |
| Share of take-home pay replaced | 61 % before tax |
Texas: 1/25 HQW, capped at 47.6% of AWW in covered employment in TX, calculated annually; $75 to $605 a week.
Compiled by Radif Partners · How the estimates are built · state laws and agency pages read October 20, 2026
Your unemployment benefit is computed from a base period, which in nearly every state is the first four of the last five completed calendar quarters before you file. A claim filed in November 2026 therefore uses wages paid from July 2025 through June 2026, and ignores the most recent quarter. If those wages are too low to qualify, many states let you use an alternate base period, the last four completed quarters. Within the base period, the high quarter is the one in which you were paid the most, and it sets the benefit in 23 jurisdictions. Another 15 use the two best quarters and 9 use the whole base period. The difference shows with uneven pay: $48,000 with $18,000 in the best quarter gives $605 a week in Texas against $480 if the same pay was spread evenly, while Oregon pays $600 either way. The agency lists your quarters on the monetary determination; check every employer and figure on it.
Finding your base period
Calendar quarters run January to March, April to June, July to September and October to December. The standard base period skips the quarter you file in and the one before it, called the lag quarter, because employers report wages to the state with a delay, and takes the four quarters before that. Filed in November 2026, a claim uses the third and fourth quarters of 2025 and the first and second of 2026. Filed in February 2027, it moves forward one quarter: October 2025 through September 2026.
Two consequences follow. Pay from your last few months of work often does not count at all. And the timing of a bonus or a raise can decide whether it helps: a commission paid in the lag quarter is outside the base period, but filing one quarter later can bring it in, and push an older quarter out. Wages count in the quarter they were paid, not when the work was done.
The alternate base period
When the standard base period does not hold enough wages to qualify, most states look at an alternate base period: the four most recently completed quarters, which includes the lag quarter. It exists mainly for people who started a job recently. If the determination says you do not qualify on wages, ask whether the alternate base period was checked, and have pay stubs ready, since those recent wages may not be in the state's records yet.
See what your best quarter changes
Unemployment in Texas
$480
| Weekly benefit | $480 |
| Weeks payable | 26 weeks |
| Total if you stay unemployed | $12,480 |
| Federal income tax on it, about | $1,408 |
The high quarter, and why it matters
The Department of Labor table of state provisions sorts the formulas into recognizable groups. In a high-quarter state, the benefit is a fraction of the best quarter alone, so one strong quarter raises it: Texas pays $605 on the uneven $48,000 above and $480 on the even version. In a two-quarter state such as Illinois, the effect is diluted, $542 against $433. In a whole-year state such as Oregon it disappears: $600 and $600. The calculator asks for the best and second-best quarters under More options for this reason.
The high quarter also appears in eligibility tests. 19 states require base-period wages of at least one and a half times the high-quarter wages, which screens out claims resting on a single quarter of work. Others set a dollar floor for the high quarter itself; California, for example, asks for $1,300 in it. A seasonal worker can have a strong high quarter and still fail the one-and-a-half test, which is where the alternate base period, or a later filing date, can help.
Reading the monetary determination
Shortly after you file, the state sends a monetary determination. It lists each employer and the wages each reported for every quarter of the base period, identifies the high quarter, and states your weekly benefit amount, the maximum benefit amount for the claim and the dates of your benefit year. It decides only the money side: whether you lost the job through no fault of your own is decided separately.
Check it line by line against your pay stubs or W-2s. Missing employers are common, especially for short jobs, work in another state, or wages paid by a staffing agency under a different name. If something is wrong, ask the agency for a reconsideration or redetermination within the deadline printed on the letter, with proof of the wages. A corrected quarter can change both the amount and the weeks. Keep filing your weekly or biweekly claims while the review is pending, or you can lose those weeks.
Same pay, different quarters
The base period is also why two coworkers laid off on the same day can get different checks. One may have had a large bonus inside the base period, the other in the lag quarter. One may have started mid-year, the other may have worked overtime in the summer. Once the quarters are on the letter, the state formula is mechanical, and the unemployment calculator will reproduce it from those figures. The state comparison shows which family each state belongs to, and the duration guide explains how the same quarters set the length of the claim.