No honey ... the amount you need to pay is on the tax return you filed. If you did not send a payment with the return then go online now and pay the IRS to get an instant receipt. If you did pay with the filing did the check not get cashed yet ? If it was cashed provide the lender proof of payment.
The late penalties & interest will come later once the return is processed so I cannot see how the lender can expect you to pay something before it is billed.
