How Much of Your Tax Bill Is 'Old Debt'? Understanding Debt Service in Your Total
Throughout this series, we’ve discussed bonds, I&S vs. M&O, and how different mechanisms (refunding, VATREs) affect tax rates. Let’s bring this down to a practical question: how much of your tax bill is going toward debt repayment, and how can you find out? For expert advice and loan quotes related to property taxes, contact American Finance and Investment Co., Inc. (AFIC).
‘Debt Service’ Is Another Term for I&S
As discussed in our M&O vs. I&S article, the I&S (Interest & Sinking) portion of a tax rate funds debt repayment — sometimes referred to as ‘debt service.’ This is the portion attributable to bonds that have been issued (and not yet fully repaid) by a taxing unit.
Where to Find This Breakdown
Many tax statements, rate notices, or ‘truth-in-taxation’ communications break down a taxing unit’s rate into its M&O and I&S components separately. If you’re looking at your tax statement and want to understand this breakdown:
- Check for separate line items or rate components labeled ‘M&O’ and ‘I&S’ (or ‘debt service’)
- Some taxing units’ websites publish current and historical rate breakdowns
- The tax rate notices published as part of the annual rate-setting process often include this breakdown
Why This Varies by Taxing Unit
Each taxing unit on your bill (school district, city, county, special districts) sets its own rate, with its own M&O/I&S split based on its own debt situation. A taxing unit with significant outstanding bond debt will have a larger I&S component than one with little or no debt — so the overall debt-service portion of your total bill depends on the combination of all your taxing units’ individual situations.
Why This Changes Over Time
The debt-service portion of a tax rate isn’t static:
- As existing bonds are paid off (reaching the end of their repayment schedule), the I&S rate needed to service that debt can decrease, all else equal
- As new bonds are issued (following a bond election), the I&S rate may increase to cover the new debt service
- Refunding can adjust the rate needed for existing debt without new voter authorization
This is part of why your tax rate can change from year to year even without a new election — existing debt service obligations evolve as bonds are issued and retired on their own schedules.
Does Debt Service Affect Your Homestead Cap?
No — the 10% homestead appraisal cap applies to your taxable value, not to tax rates. Debt service (I&S) is a rate component that gets applied to your taxable value just like the M&O component — the cap doesn’t distinguish between how the resulting tax dollars are used.
Putting It All Together
Across this series, we’ve covered: what bonds are and fund, how different taxing units issue them, the GO vs. revenue bond distinction, refunding/refinancing, bond elections vs. VATREs, and now how to identify the debt-service portion of your own bill. Together, this gives you a fuller picture of the governmental finance side of your property tax bill — complementing the appraisal, exemption, and protest topics covered in our other categories.
Manage Your Property Taxes with AFIC
Whatever the breakdown of M&O, I&S, and other components on your bill, the total amount due — and any delinquent balance — is something AFIC can help with.
American Finance & Investment Co., Inc. (AFIC) has helped Texas property owners understand and manage their property tax obligations for over 80 years. See if you qualify for a property tax loan.
Frequently Asked Questions
It’s another term for the I&S (Interest & Sinking) portion of a tax rate, which funds repayment of bonds.
Tax statements, rate notices, and truth-in-taxation communications often show this breakdown; taxing unit websites may also publish it.
As old bonds are paid off, the I&S rate may decrease; as new bonds are issued, it may increase — this evolves on each taxing unit’s own schedule.
No — the cap applies to taxable value, not to how the rate is divided between M&O and I&S.
No — each taxing unit has its own M&O/I&S split based on its own debt situation, so your overall debt-service exposure depends on all of them combined.
