United States · unemployment insurance
Unemployment base period calculator.
See which calendar quarters your state looks at to decide if you qualify, and whether an alternate base period could help. Source: U.S. Department of Labor.
An explanation of the rule, not a claim decision
Your state agency decides your base period and benefit year. Nothing you enter leaves your browser and nothing is stored.
Your claim
Your base periods
How it works
A base period is the look-back window of wages a state examines to decide whether you qualify for unemployment and how much you receive. The U.S. Department of Labor says almost all states use the first four of the last five completed calendar quarters before the claim is filed. That leaves a gap of up to six months between the end of the base period and your filing date, so your most recent work is not counted.
Many states add an alternative base period: the last four completed calendar quarters, which brings in the recent quarter that the regular method skips. DOL Table 3-1 lists 40 of the 53 jurisdictions with one. Massachusetts, Minnesota, New Jersey and Vermont work differently, and the page notes this when you pick them. Extended base periods for people who were disabled or on workers’ compensation also exist in some states and are not calculated here.
Worked example. File on October 15, 2026. The last completed quarter is Q3 2026 (July to September). The last five completed quarters are Q3 2025 to Q3 2026, so the regular base period is the first four: July 1, 2025 to June 30, 2026. An alternative base period would run October 1, 2025 to September 30, 2026.
Sources and as-of date. U.S. Department of Labor, Comparison of State Unemployment Insurance Laws 2023, Chapter 3 (Base-Periods and Table 3-1), the latest edition listed on the DOL state UI laws page, retrieved October 2026. State laws change; confirm with your state workforce agency.
Frequently asked questions
What is a base period for unemployment?
It is the look-back period of wages and hours that a state examines to decide whether you have earned enough to qualify and how much your weekly benefit is. The U.S. Department of Labor says almost all states use the first four of the last five completed calendar quarters before you file.
How do I calculate my unemployment base period?
Find the last completed calendar quarter before the date you file, count back five completed quarters, and drop the most recent one. If you file on October 15, 2026, the base period is July 1, 2025 through June 30, 2026. The calculator above does this for any date.
What is an alternate base period and which states have one?
It is the last four completed calendar quarters, used when the regular base period gives too few wages. In the DOL 2023 Comparison, 40 of 53 jurisdictions list one. States without a listed alternative include Alabama, Florida, Louisiana, Mississippi, Missouri, North Dakota, Arizona, Indiana, Kentucky, Pennsylvania, Tennessee, Texas and Wyoming.
Why does my base period skip my most recent months of work?
The regular base period ends up to six months before you file because it uses completed quarters of wage records that employers have already reported. That lag is why an alternative base period can help someone who started a new job recently.
Does the date I lost my job or the date I file matter?
The base period is built from the date the claim is filed. Filing a few weeks later can move the base period forward by a full quarter, which can matter if your recent quarters had higher wages. Confirm timing with your state agency.
Will the agency use the alternate base period automatically?
It depends on the state. Some check it automatically when you fail the regular test, while others expect you to ask. If your state is on the list, ask the agency whether an alternative base period was reviewed.