What is an HOA supplemental or catch-up assessment?
Reviewed by the OurHOA team · Updated June 2026
What a supplemental or catch-up assessment is, why boards levy one mid-year to cure a budget shortfall, how it differs from a special assessment, and the limits and notice that apply.
What it is
A supplemental or catch-up assessment is an additional charge an HOA collects partway through its budget year when the regular dues it set are no longer covering the bills. Instead of waiting for the next annual budget, the board raises the money it needs now - often as a temporary surcharge added to each owner's regular installments for the rest of the fiscal year, or as a one-time top-up. The goal is to close a gap between what the association budgeted and what it's actually spending, so the community can keep paying its vendors and obligations on time.
Why boards levy one mid-year
Supplemental assessments usually trace back to a budget that fell short. Insurance premiums spike at renewal, a utility or landscaping contract comes in higher than projected, several owners fall delinquent and collections lag, or an unbudgeted repair eats into operating cash. When the shortfall is structural - the dues simply weren't set high enough - a board may use a mid-year supplemental assessment to get back to even rather than let the deficit compound. Our guide on what an HOA budget shortfall or deficit is explains the underlying problem these assessments are meant to fix.
How it differs from a special assessment
The two get confused, but they answer different needs. A special assessment funds a specific, often large and capital, expense - a new roof, a repaved road, an insurance deductible after a claim - and is typically a defined dollar amount per home for that project. A supplemental or catch-up assessment, by contrast, plugs an operating shortfall in the current budget: it's about day-to-day expenses outrunning day-to-day income. Some governing documents treat a catch-up as a form of special assessment and run it through the same approval process; others let the board adjust within the operating budget. Either way, knowing which bucket the charge falls in tells you which rules and limits apply. Our guide on HOA special assessments covers the project-funding side in detail.
Limits, approval, and notice
A board's power to impose a mid-year increase isn't unlimited. Many states cap how much a board can raise total assessments in a year without a membership vote: California Civil Code section 5605, for example, generally bars the board from increasing regular assessments more than 20 percent, or imposing special assessments exceeding 5 percent of the budgeted gross expenses, in a fiscal year without owner approval - with a narrow emergency carve-out under Civil Code section 5610 for things like a court order or a sudden necessary repair. The governing documents may set their own caps and notice periods on top of state law. Before any increase takes effect, owners are typically entitled to advance written notice of the amount and the new due dates.
What owners can do
If you're hit with a supplemental assessment, ask for the revised budget that justifies it and confirm the board followed the right process: the correct vote (board versus membership), any applicable cap, and proper notice. A legitimate catch-up assessment comes with numbers you can inspect - what was budgeted, what's being spent, and why the gap opened. If the increase exceeds the statutory or document cap without the required owner vote, or the notice was defective, you can raise that in writing and, where your state allows, pay under protest while you challenge the procedure rather than simply withholding payment.
How OurHOA helps
Mid-year assessments cause the least friction when owners can see the math behind them. OurHOA helps self-managed boards keep the budget, actual spending, and reserve picture in one place, share the revised numbers and notice with every owner, and track who has paid - so a catch-up assessment reads as a transparent response to a real shortfall instead of a surprise bill no one can explain.
OurHOA is the friendly, affordable way self-managed communities keep dues, records, and reminders in one place. See how it works.
These guides are general education for HOA boards and residents, not legal, tax, or financial advice. Rules vary by state and by your community's governing documents - check with a professional for your situation.