For regular debt owed the government you can't usually be jailed, if it's not as a result of fraud: the IRS can try various ways to coerce you into paying, but

For regular debt owed the government you can't usually be jailed, if it's not as a result of fraud: the IRS can try various ways to coerce you into paying, but they cannot jail you for an outstanding debt that you really can't pay. Instead they resort to negotiating repayment plans, garnishing wages, etc.