If you owe back taxes the IRS is constantly adding on interest and penalties to your balance. Your debt will grow about 2% per month in combined interest and penalties, adding nearly 24-25% to your balance every year. If you owe $10,000, after one year your debt grows to $12,400. Worsening your plight is that the IRS applies any payments or refunds to interest and penalties first, causing the "principle" of your tax debt to be reduced more slowly. This is one reason installment agreements are so expensive. Your payments are applied to principle and interest first, but the principle and interest continues to compound each month you are in the installment agreement. Consider these possible solutions:
More on 3 Ways to Rid Yourself of IRS Debt and Its Accruing Interest and Penalties

