Loan and mortgage calculator with amortization schedule

An online tool for loan and mortgage maths: it builds the amortization schedule on the actual number of days in each month and shows the overpayment and the effective rate including fees and insurance. The loan you enter once feeds every other mode — extra payments, refinancing, affordability and the tax refund all run off the same figures. Alongside are a savings calculator with interest tax, an inflation adjustment and a gross-to-net salary breakdown.

How to calculate a loan

1
Enter the loan

Amount, rate, term and start date. Choose equal payments or equal principal.

2
Add fees and insurance

In the extra-conditions block — they feed the effective rate and the total you pay.

3
Read the schedule

By year or month to month: payment, interest, principal and the balance on every date.

4
Test an extra payment

Switch to the next mode and add payments — the term-versus-payment comparison appears immediately.

5
Save or compare

Pin the result as option A and change the terms to see the difference. The permalink reopens the same numbers on any device.

Work out the payment, the overpayment and what an extra payment really saves

Borrowing
Money
Loan purpose

Loan details

What the lender asks for each month.
Fill this in and the loan amount follows.
Equal payments stay the same every month. Equal principal starts higher and falls, but costs less overall.
Lenders accrue interest on the actual number of days in each month. Almost every web calculator divides the rate by 12 — that is where the mismatch with your statement comes from.
Fees, insurance and rate changes
Charged on the outstanding balance and included in the effective rate.
Shows what the payments are worth in today’s money.
The surplus goes straight to principal. 0 — no rounding.

Extra payments

Add a one-off or recurring extra payment — the calculator compares both outcomes: shorten the term or lower the payment.

New terms

The outstanding balance is derived from the loan details above — no need to enter it again.

How many payments you have made on the current loan.
Leave empty and it is derived from the schedule: :amount.

Your income

Lenders usually work with 40–50%.
Property tax, insurance, utilities — they reduce what you can borrow too.

Deposit or savings

Enter a target and the calculator solves for the monthly contribution. 0 — no goal.

Inflation and purchasing power

A deposit or bond rate — we show the real return after inflation.

Property tax refund

Mortgage interest comes from the loan details above. Calculated at the 13% Russian income-tax rate.

It determines how many years the full refund takes.
A second cap of 3M ₽ of interest paid — up to 390,000 ₽ more back.

Salary

—
—
This is a reference calculation: your lender may use its own rounding, fees and posting dates. Tax rates and the central-bank key rate change over time — the date of the last check is shown in the result. Reconcile the schedule with your lender before signing.

What the calculator does

Schedule on actual days
Interest accrues on the real number of days in each period with a 365/366 divisor, the way a loan agreement is written. The ÷12 mode sits next to it so you can see exactly where other calculators diverge.
Extra payments: term versus payment
One-off and recurring extra payments, with both outcomes computed side by side and a plain verdict on which one wins and by how much.
Effective rate with fees
The true cost of the money, derived from the actual cash flow including origination fees, monthly charges and insurance on the outstanding balance.
Refinancing with a break-even point
Three futures at once: do nothing, take the lower payment, or keep paying the old amount — the last is usually the best and almost nobody calculates it.
Savings with tax and a goal
Compounding, contributions, effective yield and interest tax whose allowance is derived from the central-bank key rate automatically.
Refund and real cost
The property tax refund year by year against the income tax you actually pay, payments adjusted for inflation, and the loan rate once the refund is counted.

How this differs from the usual loan calculator

A typical loan calculator divides the rate by twelve, prints a payment and an overpayment, and stops there — after which you visit five other pages to work out extra payments, refinancing and the tax refund, retyping the same figures each time. Here the loan is entered once and feeds every mode, interest accrues on actual days the way the agreement says, fees and insurance land in the effective rate, and refinancing is compared against three futures including the one where you keep paying the old amount. Any result can be pinned and compared side by side, or shared as a link.

Frequently asked questions

Why does the total differ from my lender’s calculator?

Usually because of how interest is accrued. Most web calculators divide the annual rate by twelve and treat every month as identical. A loan agreement normally says something else: interest accrues on the outstanding balance for the actual number of days in the period, with the year counted as 365 or 366 days. That is why February and March produce different interest under the same payment. The precise mode is on by default here, with a switch to the simplified one right beside it, and the gap between them is reported in the result.

Is it better to shorten the term or lower the payment?

Shortening the term almost always saves more interest, because the debt closes sooner. Lowering the payment eases the monthly load but interest keeps accruing for the whole original term. The calculator runs both from the same inputs and shows the difference in money and in months — the choice depends on whether you need the total saving or the monthly breathing room.

What is the effective rate and how does it differ from the contract rate?

The contract rate covers interest only. The effective rate accounts for the whole cash flow: what you actually received after the origination fee, and what you pay out including monthly charges and insurance. It is solved as the internal rate of return of that flow using the real payment dates. That single number is what lets you compare two offers with different rates and different fees honestly.

How is tax on deposit interest calculated?

Only the amount above a tax-free allowance is taxed. In Russia that allowance is 1,000,000 ₽ multiplied by the highest key rate in force on the first day of any month of the year. The calculator reads it from a built-in key-rate history, so the figure updates on its own. Interest belongs to the year in which it is actually paid or compounded — a deposit maturing in January falls into the next tax period.

Equal payments or equal principal?

With equal principal the debt is repaid in equal slices, so interest accrues on a faster-shrinking balance and the total cost is lower. The price is a high payment in the early years, which means a lender will approve a smaller loan on the same income. Equal payments are easier to budget around. Switch the payment type and the difference in overpayment appears immediately.

Are my figures saved, and can I share a calculation?

The calculation runs on the page, and the "link to this calculation" button packs every input into the page address. You can bookmark or send that link and it reopens the exact same terms. The result also exports to CSV and PDF and copies as plain text for correspondence with a lender or an agent.

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