Downpayments
A pro version option, it subtracts a downpayment from the slider value before calculating the repayments.
You can set a fixed downpayment, a percentage of the principal or a combination of both.
In the example below you can’t move the downpayment slider to a higher value than the loan amount. If you set the downpayment to the max and drag the loan amount slider down it will pull the downpayment slider along.