California Rent Increase Calculator accuracy and testing

Formula source

• Monthly amount over entered cap = max(0, current rent x proposed increase percent - current rent x allowed planning cap percent).

Test cases

Known limitations

• Planning estimate only; not tax, legal, insurance, utility, financial, or real estate advice. Verify current local rules, policies, rates, exemptions, caps, exceptions, official notices, utility tariffs, insurance declarations, and qualified advisors before relying on any result. This does not evaluate AB 1482 coverage, local rent control, exemptions, notice timing, banking rules, passthroughs, or tenant remedies.

Assumptions

• All rates, caps, windows, premiums, and charges are editable planning examples.
• No live local tax, utility, rent, legal, insurance, or program rate is fetched or guaranteed.
• Calculations run client-side in the browser and are based only on the values entered.

Unit handling

• Current Monthly Rent accepts values in $.
• Proposed Increase accepts values in %.
• Allowed Planning Cap accepts values in %.
• Comparison Months accepts values in months.
• Monthly Amount Over Entered Cap is displayed as currency.

Rounding rules

• Number displays use up to 2 decimal places in the calculator UI.
• Currency outputs are displayed with standard US dollar formatting.
• Input precision follows configured step values where provided.

Version history

Change log