Federal law sets no pay frequency requirement. It requires only that you be paid on the regular payday for the period covered. Every rule about weekly, biweekly or semi-monthly pay comes from a state, and several states set different minimums for different industries or for manual as against clerical workers.
What federal law does say
Wages are due on the regular payday for the pay period. That is a rule about consistency, not frequency — an employer paying monthly on time complies with federal law entirely.
What states add
Most set a minimum frequency, commonly semi-monthly or biweekly. Several distinguish by worker type, with manual workers entitled to more frequent pay than clerical or professional staff. Some require a specific gap between the end of a period and payday, which is the rule employers most often breach when they change payroll providers.
Changing the schedule
An employer can generally change pay frequency going forward with proper notice, and cannot use the change to delay wages already earned. The transition week is where problems appear — moving from weekly to biweekly stretches one gap, and that gap still has to satisfy the state rule.
Why frequency matters beyond convenience
A longer cycle means more of your earned wages are held at any moment, which matters if the employer fails. It also affects how quickly a payroll error is noticed and how large it has grown by then.
Late is a violation, not an inconvenience
Wages paid after the required date are late wages, and several states provide penalties for it separately from the wages themselves. A pattern of paying two days late is a claim, not a quirk.
Where to check
Your state labor agency lists the required frequency and any worker-type distinction. It takes a minute and it is the only place the answer actually exists.
Common questions
Does federal law require weekly or biweekly pay?
No. It requires only that wages be paid on the regular payday for the period. Frequency rules come from states.
Can my employer pay monthly?
Under federal law yes, if it is the regular payday. Your state may require more frequent payment.
Do rules differ by job type?
In several states, yes. Manual workers are often entitled to more frequent payment than clerical or professional staff.
Can the schedule be changed?
Generally going forward with proper notice, and never to delay wages already earned. The transition period still has to meet the state rule.
Is being paid late a violation?
Yes. Several states provide penalties for late payment separately from the wages themselves.