Short answer: Collin County's own 2025 rate is 0.149343% of taxable value ($0.149343 per $100). It's one line of your bill. Your city, school district and special districts add the rest.
$400,000 homestead in Plano: $140,000 school homestead exemption, no local optional exemptions assumed, includes Collin County Junior College District.
Collin County $597
Plano $1,750
Plano ISD $2,703
Collin County Junior College District $325
Example: $400,000 homestead in Plano
Unit
Taxable
Rate
Tax
Collin County
$400,000
0.149343%$0.149343 per $100
$597.37
Plano
$400,000
0.4376%$0.4376 per $100
$1,750.40
Plano ISD
$260,000
1.03955%$1.03955 per $100
$2,702.83
Collin County Junior College District
$400,000
0.08122%$0.08122 per $100
$324.88
Total
1.707713%$1.707713 per $100
$5,375.48
Collin County's own rate is low compared with most large Texas counties, so the city and school district make up most of a typical bill. The Collin County Junior College District (Collin College) rate is included in the example. Newer areas outside city limits often sit in one of the county's 31 special districts (MUDs and similar).
Protest deadline: May 15 (next business day if that falls on a weekend), or 30 days after the notice is mailed — whichever is later (Tax Code §41.44). Check your notice.
County rate
Collin County 2025 county rate
Taxing unit
Rate
Tax on $100,000
Collin County
0.149343%$0.149343 per $100
$149
City rates (30)
Cities in Collin County, 2025. (split) = spans more than one county
Taxing unit
Rate
Tax on $100,000
Allen
0.4154%$0.4154 per $100
$415
Anna
0.525073%$0.525073 per $100
$525
Blue Ridge
0.429606%$0.429606 per $100
$430
Carrollton (split)
0.5375%$0.5375 per $100
$538
Celina (split)
0.576401%$0.576401 per $100
$576
Dallas (split)
0.6988%$0.6988 per $100
$699
Fairview
0.316658%$0.316658 per $100
$317
Farmersville
0.725%$0.725 per $100
$725
Frisco (split)
0.425517%$0.425517 per $100
$426
Garland (split)
0.689746%$0.689746 per $100
$690
Josephine (split)
0.468097%$0.468097 per $100
$468
Lavon
0.42%$0.42 per $100
$420
Lowry Crossing
0.2%$0.20 per $100
$200
Lucas
0.255463%$0.255463 per $100
$255
McKinney
0.412284%$0.412284 per $100
$412
Melissa
0.454116%$0.454116 per $100
$454
Murphy
0.357514%$0.357514 per $100
$358
Nevada
0.22146%$0.22146 per $100
$221
New Hope
0.200635%$0.200635 per $100
$201
Parker
0.310439%$0.310439 per $100
$310
Plano (split)
0.4376%$0.4376 per $100
$438
Princeton
0.440226%$0.440226 per $100
$440
Prosper (split)
0.505%$0.505 per $100
$505
Richardson (split)
0.54218%$0.54218 per $100
$542
Royse City (split)
0.578%$0.578 per $100
$578
Sachse (split)
0.650416%$0.650416 per $100
$650
Saint Paul
0.208008%$0.208008 per $100
$208
Van Alstyne (split)
0.553713%$0.553713 per $100
$554
Weston
0.36%$0.36 per $100
$360
Wylie (split)
0.543438%$0.543438 per $100
$543
School district rates (21)
School districts in Collin County, 2025
Taxing unit
Rate
Tax on $100,000
Allen ISD
1.1258%$1.1258 per $100
$1,126
Anna ISD
1.2399%$1.2399 per $100
$1,240
Bland ISD (split)
0.85693%$0.85693 per $100
$857
Blue Ridge ISD (split)
1.2452%$1.2452 per $100
$1,245
Celina ISD (split)
1.2089%$1.2089 per $100
$1,209
Community ISD (split)
1.2077%$1.2077 per $100
$1,208
Farmersville ISD
1.215%$1.215 per $100
$1,215
Frisco ISD (split)
1.0194%$1.0194 per $100
$1,019
Leonard ISD (split)
1.2252%$1.2252 per $100
$1,225
Lovejoy ISD
1.2552%$1.2552 per $100
$1,255
McKinney ISD
1.1043%$1.1043 per $100
$1,104
Melissa ISD
1.2245%$1.2245 per $100
$1,225
Plano ISD
1.03955%$1.03955 per $100
$1,040
Princeton ISD
1.2072%$1.2072 per $100
$1,207
Prosper ISD (split)
1.2141%$1.2141 per $100
$1,214
Rockwall ISD (split)
1.0669%$1.0669 per $100
$1,067
Royse City ISD (split)
1.2552%$1.2552 per $100
$1,255
Trenton ISD (split)
1.2072%$1.2072 per $100
$1,207
Van Alstyne ISD (split)
1.1748%$1.1748 per $100
$1,175
Whitewright ISD (split)
0.9781%$0.9781 per $100
$978
Wylie ISD
1.1752%$1.1752 per $100
$1,175
Special district rates (31)
Special districts in Collin County, 2025 (MUDs, ESDs, hospital, college and others)