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SISK LN TX 78620

Travis County, TX · Parcel 0518060107
2026 Property Tax Calendar ◷ Today: September 17, 2026
Valuation Date
Jan 1
Notices Mailed
Apr 15
Protest Deadline
May 15
Roll Certified
Jul 25
Rates Adopted
Sep 1
Payment Due
Jan 31
This parcel is classified Agricultural, not Residential — homeowner-specific features like homestead savings don't apply here and are hidden below. Switch to Investor mode ↗ for analysis suited to non-residential property.
At a Glance
2025 Appraisal Certified
What this property was worth
$1,400,357
This property's 2025 certified value. Verified
What this property is taxed on
$68,642
This property's 2025 taxable value — 95% below market value. Verified
What this property paid in taxes
~$1,115
Estimated by adding up 2025 entity-level billing records — some taxing entities may be missing from this total. Partial
Homestead Exemption
Not applicable
Homestead exemptions apply only to an owner-occupied primary residence. This parcel is classified Agricultural, so this doesn't apply here.
2026 Certified
What this property is worth (2026 certified)
$2,064,453
TCAD's 2026 certified appraisal — +47% vs. 2025. Final, not subject to change. Certified
What this property will be taxed on (2026 certified)
$97,936
TCAD's 2026 certified taxable value — 95% below market value. Final, not subject to change. Certified
Estimated 2026 taxes
~$1,590
2026 taxable value × this property's entities' 2025 rates — 2026 rates aren't adopted until August/September, so this uses last year's rates as the best available assumption. Estimated
Homestead Exemption
Not applicable
Homestead exemptions apply only to an owner-occupied primary residence. This parcel is classified Agricultural, so this doesn't apply here.
This Account Includes 2 Units (2026 values — the figures above on this page are the sum of these rows)
Unit (prop_id) Owner Address Market Value Assessed Value Taxable Value
354629 COSTELLO ARTHUR P 9101 SISK LN 4 78620 $2,064,453 $97,936 $97,936
354630 COSTELLO ARTHUR P 0.000 — — —
Satellite View Imagery: Esri
Satellite image not available
We couldn't locate this property on the map — this can happen for parcels whose address our geocoder can't confidently match.
Your Tax Bill, This Year
This Property's 2026 Value: Preliminary → Certified how this property's 2026 value moved since the June 9, 2026 preliminary notice
2026 Preliminary Preliminary 2026 Certified Certified Change
What this property is worth $2,064,453 $2,064,453 +0 (+0.0%)
What this property will be taxed on $97,936 $97,936 +0 (+0.0%)
Preliminary from TCAD's June 9, 2026 export; certified from TCAD's July 25, 2026 certified appraisal roll — final, not subject to change. Taxable-value comparison uses the same homestead-cap-aware figure shown elsewhere on this page, not TCAD's raw preliminary/certified export value.
Where This Property's 2025 Tax Dollars Went
Taxing Entity Taxable Value 2025 Rate Paid Share
Lake Travis ISD $68,642 1.0397% $714 64.0%
Travis County $68,642 0.3758% $258 23.1%
Travis Central Health $68,642 0.1180% $81 7.3%
Travis County ESD # 06 $68,642 0.0904% $62 5.6%
Total — 1.6240% $1,115 100%
Exemptions

No exemptions are currently applied. This parcel is classified Agricultural, so the homestead exemption (which requires an owner-occupied primary residence) doesn't apply here.

How We Got Here
This Property's Value Over Time

Here's how this property's value has changed over the past 6 years.

This Property's Value vs. What It's Taxed On gap up to 95.3%

The top line is this property's certified market value. The bottom line is its taxable value — the number its tax bill is actually calculated from. The gap between them is real money: it's what an exemption or value-limitation adjustment is protecting this property from being taxed on.

This gap reflects a value-limitation adjustment reducing what's actually taxed below the certified market value — not a data error. Same figures as the certified values on record for this parcel.
Tax Rate & Bill — Last 5 Years
YearCombined Tax RateTaxes Paid
2025 1.6240% ~$1,115 Partial
2024 1.6056% $1,012 Verified
2023 1.5625% $826 Verified
2022 1.7157% $369 Verified
2021 1.7993% $386 Verified
Combined rate = the total of all this property's taxing entities' rates that year. Years marked “Verified” are confirmed directly from the Travis County Tax Office. Years marked “Partial” are reconstructed from portal payment receipts or incomplete billing records and may not reflect every adjustment. Where no billing record exists for a year, an estimate computed from that year's certified taxable value × combined rate may be shown instead (marked “Computed”) — not an actual billed amount.
How This Parcel Compares
How You Compare to Agricultural Peers

This property's value is higher than the typical Agricultural property in Travis County (county median: $597,708).

Because property taxes are based on value, the tax bill is likely higher than similar properties.

More Resources
Helpful Links
Protest your property value ↗
Pay your property taxes ↗
Contact TCAD ↗
View this property on TCAD ↗
Open County Interactive Map ↗
Post-Acquisition Tax Estimate Estimate · Not a prediction
Property: · 99 SF gross · 22.220 ac lot
$

Estimate only. The appraisal district sets value as of Jan 1 (not at sale price). A sale is strong evidence of market value and is typically reflected in the next Jan 1 valuation. Taxing units set rates annually. Modeled from government data — not a legal or tax opinion.

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