How do I calculate past-due rent in the US?
Multiply the monthly rent by the number of unpaid months, add any partial-month balance, then add allowable late fees and returned-payment (NSF) charges permitted by your state and lease. Subtract any payments the tenant made and any credit you agree to apply.
How much can a landlord charge in late fees?
It varies by state. Many states require late fees to be 'reasonable' and some cap them: for example a percentage of monthly rent or a fixed dollar amount. States like California require the fee to be a good-faith estimate of actual loss. Always check your state statute and the lease before adding late fees to arrears.
What notice must I serve before eviction for unpaid rent?
Most states require a written 'pay or quit' notice giving the tenant a set number of days (commonly 3, 5, or 14) to pay the arrears or move out. Only after that period expires can you file an eviction (unlawful detainer) action in court.
Can I deduct arrears from the security deposit?
Generally you apply the security deposit to unpaid rent and damages after the tenant vacates, not during the tenancy. State law sets a deadline (commonly 14–30 days) to return the remaining deposit with an itemized statement. This calculator lets you subtract the deposit to see the net owing at move-out.