| FORM | FORMAT | DUE DATE | FILED BY | CONTENT | USE | STATUTE | PENALTY | WAIVER | CONTACT |
| Paper form | N/A | CEO | User Authorization | To file required reporting in OPM Portal | N/A | N/A | N/A | Debra McCarthy | |
| Paper application | Prior to date on which Assessor signs Grand List | Taxpayer | Application for Totally Disabled Exemption | Grant purposes. Must submit to Assessor with proof of disability | CGS 12-81(55) | none | none | Patrick Sullivan | |
|
Declaration of Personal Property |
Paper application | November 1 | Taxpayer | Listing of assets with financial data | Determination of taxable personal property | CGS 12-41 | 25% | CGS 12-41 | Municipal Assessor |
| M-1 | OPM Portal | July 1 | Tax Collector | Mill rate(s) and property tax levies | Various state grant purposes | CGS 12-9 and 7-325 | $100 | RCSA 12-9-2 | Gregory Lowrey |
| M-13 | OPM Portal | May 1 | Assessor | Taxable grand list and property exemption data | Equalized Net Grand List (ENGL) calculations and Annual report to the General Assembly | CGS 12-120 | $100 | RCSA 12-120-2 | Gregory Lowrey |
| M-13a | OPM Portal | May 1 | Assessor | Tax exempt grand list data | Annual report to the General Assembly | CGS 12-120 | $100 | RCSA 12-120-2 | Gregory Lowrey |
| Paper report with electronic file submitted to OPM | July 1 | Assessor and Tax Collector | Municipal Claim for Reimbursement - Elderly Homeowners | Grant purposes and Annual report to the General Assembly | CGS 12-170aa(g) | $250 | RCSA 12-170aa-4 | Patrick Sullivan | |
| Paper application | February 1 - May 15 | Taxpayer | Elderly Homeowner Application | Grant purposes. Statute requires submission to Assessor with proof of income | CGS 12-170aa(f) | none | none | Patrick Sullivan | |
| Paper report | October 1 | Assessor | Reductions to Elderly Homeowners Claim for Reimbursement | Grant purposes | CGS 12-170aa(i) | $250 | RCSA 12-170aa-4 | Patrick Sullivan | |
| Paper application with electronic submission by municipality | April 1 - September 30 | Taxpayer | Application for Renter's Rebate | Grant purposes. Statute requires submission to Assessor/Municipal Agent with proof of income and rent/utilities paid | CGS 12-170f | none | none | Patrick Sullivan | |
| Paper report | January 1 | Assessor and Tax Collector | Municipal Claim for Reimbursement - Elderly Homeowner Freeze Program | Grant purposes and Annual report to the General Assembly | CGS 12-129d | $250 | RCSA 12-129d-2 | Patrick Sullivan | |
| Paper report | October 1 | Assessor | Reductions to Freeze Reimbursement | Grant purposes | CGS 12-129b(d) | $250 | RCSA 12-129b-2 | Patrick Sullivan | |
| Paper application | February 1 - May 15 | Taxpayer | Application for Elderly Homeowner Freeze Program | Grant purposes. Statute requires submission to Assessor with proof of income | CGS 12-129c | none | none | Patrick Sullivan | |
| M-37 | OPM Portal | April 1 | Assessor | Report of State Owned Real Property | Grant purposes | CGS 12-19b | $250 | RCSA 12-129b-2 | Gregory Lowrey |
| M-37C&H | OPM Portal | April 1 | Assessor | Report of Colleges and Hospitals Real Property | Grant purposes | CGS 12-20b | $250 | RCSA 12-20b-2 | Gregory Lowrey |
| Paper report | July 1 | Assessor | Municipal Claim for Reimbursement - Totally Disabled Program | Grant purposes | CGS 12-94a | $250 | RCSA 12-94a-2 | Patrick Sullivan | |
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Paper application | November 1 | Taxpayer | Tax Exemption Application for Certain Energy Systems | Exemption Application | CGS 12-81 (56), (57), (62), (63) | None | None | Jennifer Gauthier |
| M-45 | OPM Portal | Monthly | Assessor and Town Clerk | Data concerning real property transfers | Determination of sales/assessment ratios used in ENGL calculation | CGS 10-261b | $1 per form | RCSA 10-261b-2 | Patrick Sullivan |
| M-46 | OPM Portal | August 1 | Assessor | Municipal Claim for Reimbursement - Distressed Municipality Program | Grant purposes and Annual report to General Assembly | CGS 32-9s | $250 | RCSA 32-9s-2 | Jennifer Gauthier |
| M-46A | OPM Portal | August 1 | Assessor | Distressed Municipality Program - real property exemptions | Grant purposes. Statute requires submission with Form M-46 | CGS 32-9s | $250 | RCSA 32-9s-2 | Jennifer Gauthier |
| M-46B | OPM Portal | August 1 | Assessor | Distressed Municipality Program - personal property exemptions | Grant purposes. Statute requires submission with Form M-46 | CGS 32-9s | $250 | RCSA 32-9s-2 | Jennifer Gauthier |
| Paper application | November 1 | Taxpayer | Application - Distressed Municipality Program | Grant purposes. Statute requires annual submission to Assessor | 12-81(59), (60), (70) | none | none | Jennifer Gauthier |
|
| Paper report with electronic file submitted to OPM | August 1 | Assessor and Tax Collector | Municipal Claim for Reimbursement - Additional Veterans' Exemption Program | Grant purposes and Annual Report to General Assembly | CGS 12-81g | $250 | RCSA 12-81g-4 | Patrick Sullivan | |
| Paper application | February 1 - October 1 | Taxpayer | Application for Additional Veterans' Exemption | Grant purposes. Regulations require submission to Assessor with proof of income | CGS 12-81g | none | none | Patrick Sullivan | |
| Paper application | November 1 | Taxpayer | Application for Commerical Vehicle Exemption | Exemption Application | CGS 12-81 (74) | none | none | Jennifer Gauthier | |
| Paper application | September 1 - October 30 | Taxpayer | Application for Maritime Heritage Land | Designation of land for assessment | CGS 12-120f | none | none | Jennifer Gauthier | |
| MM&E | OPM Portal | May 1 | Assessor | MM&E Exemptions | Annual Report to General Assembly | CGS 12-120c | none | none | Jennifer Gauthier |
| Guidance | N/A | Tax Collector | Municipal Tax Bill Language with Scholarship Fund | Local Option | CGS 12-169a | none | none | Municipal Tax Collector | |
| Revaluation | OPM Portal Demonstration | Within timeframe of signing Grand List | Assessor | M-64 Veterans, Performance Based Revaluation Certification | Statute requirements | CGS 12-62 | none | none | Jennifer Gauthier |