About BillMapper
BillMapper is a free planner for the bills that don’t come every month, with reference guides on what U.S. households actually pay for them.
Why this exists
Property tax, car insurance, registration and annual renewals land a few times a year, so a normal monthly budget misses them until the bill arrives. Averaging them over twelve months is not enough either: an early, large bill can still leave you short. BillMapper shows when each irregular bill lands, what to set aside, and the starting balance your own schedule needs, alongside public data on what these bills typically cost.
What you'll find here
- Annual bill calendar: map irregular bills by due date, find the tight months, and export the dates to your calendar.
- Reference data: what U.S. households spend on 15 non-monthly bills (BLS Consumer Expenditure Surveys) and median property tax in every state (Census Bureau).
- Guides on budgeting for irregular expenses, planning for your worst month and where to find the annual bills to list. Browse all guides.
How we build our tools and tables
- Use public data and show where it came from. Household averages come from the Bureau of Labor Statistics and property-tax medians from the Census Bureau. Each guide names the table, the survey year and the link, and explains what the figure does and does not measure.
- Show the method. The planner explains how it spreads a bill across the year, works out the long-run contribution and tests the opening balance from a selected start month. You can check it with a calculator.
- Run everything in your browser. The planner is 100% client-side. The bills and amounts you type are never uploaded, logged or sold. Anything you save lives in your own browser’s storage, and you can clear it in one click.
- Stay in our lane. We publish reference data and cash-flow estimates. We are not financial advisers and we don’t sell insurance, loans or financial products.
Who runs it
BillMapper is an independent site run by a small publishing team. Guides carry the editorial byline Jordan Avery, a pen name the team uses for its writing and editing. No company pays to be mentioned. If a figure is out of date or a guide gets something wrong, tell us.
How we research, cite and correct our guides
Figures come from government statistical releases such as the BLS Consumer Expenditure Surveys and the Census Bureau's American Community Survey, and consumer rules from agencies such as the FTC and the Consumer Financial Protection Bureau. Each guide links the sources it used and shows the date it was last updated. When a source is ambiguous or a figure does not mean what it seems to, we say so instead of guessing.
Worked examples use sample amounts and dates so the arithmetic is easy to follow; replace them with your own bills in the planner.
To report an error, email us from the contact page with the page address, what looks wrong and, if you have one, the source that shows the correct figure. Confirmed corrections are made on the page and reflected in its update date.
How we keep it free
The site is free to use and does not require an account. We intend to support it with display advertising (Google AdSense); ads are not switched on yet, and we do not use affiliate links. When that changes, the ad and affiliate disclosure and privacy policy will be updated first.