Make the result useful
Build a tax reserve that survives a good month
A tax reserve is operating cash with a job, not an estimate of what you will owe. Start with profit measured on the same basis as the records you will review with your preparer, then choose a deliberately stated reserve percentage. Keeping the percentage visible makes it easier to change when income, ownership, or tax circumstances change.
Do not let an unusually strong collection month turn into an owner draw by default. Move the calculated reserve into a labeled account or ledger bucket, record the transfer date, and compare the balance with the next expected payment date. The useful outcome is a repeatable cash-control habit, not a false sense of tax precision.
The assumptions that move this result
Quarterly profit
Profit for one stated period, using the same accounting basis each time.
Reserve percentage
Your planning rate; it is not a tax-rate determination.
Reserve already saved
Cash already set aside specifically for this purpose, not the general bank balance.
Payment calendar
A separate record of expected filing or payment dates that gives the reserve a deadline.
target reserve = period profit × selected reserve percentage; funding gap = target reserve − cash already reserved
The result is the amount of additional property cash to earmark for the stated period under your chosen reserve policy.
Read the number in context
Uneven-income month
A vacancy turns the next quarter negative. The formula may show no new reserve requirement, but it does not erase a payment already due from a previous profitable period.
Distribution decision
If the property account has $2,000 but $700 is unpaid vendor work and $400 is a reserve gap, only $900 is unassigned before any separate operating reserve is considered.
This is not a tax estimate, filing schedule, or advice on entity, depreciation, passive-loss, or owner-specific treatment.
Before you act
• Reconcile income and expenses to source records first.
• Keep tax reserve distinct from repair and operating reserves.
• Review the percentage and payment calendar with a qualified tax professional.
Quarter-end reserve check
A property shows $3,200 of pre-tax rental profit for the quarter. At a 25% planning reserve, the target is $800. If $400 is already segregated, the calculator identifies a $400 funding gap before a distribution is considered.
Should I reserve from gross rent?
This tool is designed around the profit basis you choose. Label that basis and apply it consistently rather than mixing gross rent with net results.
Can the reserve be invested?
That is a liquidity and tax-planning decision outside this calculator. Keep any funds needed for near-term payments accessible.
What record supports the result?
Save the period profit report, selected rate, prior reserve balance, and the transfer or ledger entry.