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Loan and mortgage math: monthly payment, amortization schedule, payoff comparison.
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A mileage logbook for deductible driving: trips, effective-dated rates, summaries, CSV export.
Keep one price list: a price per SKU, per currency, per tier, from the day it applies.
Overdue invoice chasers: reminder 1, reminder 2, the final notice, and the day's chase list.
Lease schedules with a residual: the payment, the interest split and the journal per month.
Milestone billing from accepted deliverables: due dates, sign-off dates, invoice-ready items.
Keep a fixed asset register: cost, depreciation to date, disposals and net book value.