Choose payment months, add extras, and model gaps. See amortization details instantly after submission today. Download CSV and PDF reports for your seasonal plan.
| Scenario | Loan | APR | Term | Pay Months | Off Payment | Extra Principal |
|---|---|---|---|---|---|---|
| Quarterly seasonal income | $25,000 | 12.50% | 24 months | Mar, Jun, Sep, Dec | $0 | $0 |
| Two busy seasons | $40,000 | 10.25% | 36 months | May, Jun, Jul, Nov, Dec | $50 | $200 |
| Monthly plus large bonuses | $18,000 | 9.90% | 18 months | All months | $0 | $150 |
Seasonal borrowers may earn most income in a few months. This tool lets you pick payment months and model zero or small off‑season payments. A $25,000 loan at 12.50% for 24 months with quarterly payment months needs larger installments than monthly repayment, but it can fit a harvest or bonus cycle. The schedule makes the trade‑off visible for your budget.
Each month, interest is computed from the monthly rate r = APR/12/100 and the current balance. When a payment month is not selected, the payment can be $0 or your chosen off‑season amount. If payment is less than interest, principal becomes negative and the balance grows. Adding even $50 in off months can reduce total interest over the term.
Auto mode finds a seasonal payment that targets payoff by the final month. It repeatedly simulates the amortization schedule and adjusts the payment until the ending balance approaches zero, then rounds to cents. This is helpful when you change the pattern, such as choosing May–July and November–December, because the required installment can shift substantially with the number of pay months.
Extra principal is added only in selected payment months. Because future interest is calculated on the remaining balance, extra principal lowers later interest charges and can shorten payoff. For instance, adding $200 extra principal in each pay month reduces the end balance faster than increasing off‑season payments by the same amount spread across many months. The table stops early when the balance reaches zero.
The Plotly graph shows how the balance drops in steps during heavy payment months and flattens during off months. Export CSV to compare scenarios in a spreadsheet, and export PDF to share a clear summary with totals and the first schedule rows. Keeping these exports lets you document assumptions, review affordability, and negotiate payment structures confidently.
Interest still accrues monthly. Your seasonal payments must be higher to cover both principal and accumulated interest, which can increase total borrowing cost.
Yes. Adding off-season payments or extra principal in payment months can reduce the balance faster, causing payoff before the full term ends.
If a month’s payment is smaller than the interest charged, unpaid interest effectively grows the balance. Increase off-season payment or seasonal payment to avoid this.
It is an estimate found by repeatedly simulating the schedule and adjusting the payment. Small rounding differences can occur, especially with very short terms.
Select the bonus months as payment months and add extra principal for those periods. This shows how occasional larger payments change payoff and interest totals.
No. It is for planning and comparison. Lender fees, compounding conventions, and timing rules may differ, so confirm final figures with official loan documents.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.