What Is the Ontario Sales Tax Credit OSTC Calculator?
The Ontario Sales Tax Credit OSTC Calculator is an online, free, no-registration financial assessment tool. It is made for Ontario residents who want to determine their sales tax refund from the provincial government. OSTC works as one of the 3 major pillars under the broader Ontario Trillium Benefit (OTB).
The Ontario Sales Tax Credit OSTC Calculator separates the specific sales tax relief calculation from the housing and energy portions of the program. You can determine your net annual OSTC payment and monthly distribution schedule by entering your baseline tax figures into this calculation tool.
Why We Need an Ontario Sales Tax Credit Calculator
Paying for groceries, retail necessities, household goods, and utility bills in Ontario involves an 8% provincial sales tax component folded into the 13% Harmonized Sales Tax (HST).
For low-income individuals and households, these sales taxes represent a disproportionate share of daily expenses. To offset this regressive financial burden, the Ontario government provides the Ontario Sales Tax Credit benefits to eligible families.
The Ontario OSTC Calculator gives you instant clarity on your OSTC allocation. This tool determines your gross entitlement, models statutory phase-out reductions, and shows your exact projected benefit amount based on your marital status, no. of dependent children, and AFNI.
Income-Testing and Progressive Phase-Outs for OSTC
This OSTC credit is not for all; it is targeted toward low- and modest-income Ontarians. The provincial government sets baseline income thresholds. If your AFNI is below these thresholds, you receive 100% of the maximum credit. For every $ your income exceeds the threshold, the credit is clawed back at an official clawback rate of 4% (4 cents per $), until your entitlement reaches zero.
What Information Is Required To Use This Tool?
Before using this Ontario Sales Tax Credit OSTC Calculator, collect these details from your most recent personal tax return:
- Marital status (Single, Married, Common-Law, or Single Parent).
- Number of Dependent Children
- Your personal Net Income from Line 23600
- Spouse's or partner's Net Income from Line 23600
- Universal Child Care Benefit (UCCB) Income from Line 11700
- Registered Disability Savings Plan (RDSP) Income from Line 12500
- UCCB and RDSP Repayments from Lines 21300 and 23200.
How Does the Calculation Work?
The Ontario Sales Tax Credit OSTC Calculator processes your inputs in accordance with Section 104 of the Ontario Taxation Act, 2007:
Stage 1: Determine Maximum Credit
Base Credit = $378 × (Applicant + Eligible Spouse + Number of Dependent Children)
Stage 2: Calculate Adjusted Family Net Income (AFNI)
AFNI = Line 23600 (Self) + Line 23600 (Spouse) − (UCCB + RDSP Income) + (UCCB + RDSP Repayments)
Stage 3: Apply 4% Income Clawback
- If Single: Statutory Threshold = $29,047
- If Family (Couples / Single Parents): Statutory Threshold = $36,309
Excess Income = Max(0, AFNI − Statutory Threshold)
Clawback Amount = Excess Income × 4% (0.04)
Stage 4: Net Annual Payment
Net OSTC = Max(0, Base Credit − Clawback Amount)
If your AFNI is below the threshold, you receive the full basic OSTC credit. If your AFNI is higher than the threshold, your OSTC is reduced by 4% over the threshold amount until it phases out completely and reaches zero.
Calculation Formulas and Statutory Thresholds
Here is the mathematical logic used by the Ontario Sales Tax Credit OSTC Calculator. It uses two primary formulas based on household composition:
Formula for Single Individuals (No Children)
$$\text{Gross OSTC} = \$378$$
$$\text{Clawback} = 0.04 \times \max(0, \text{AFNI} - \$29,047)$$
$$\text{Net Annual OSTC} = \max(0, \$378 - \text{Clawback})$$
Where:
- $378: Maximum annual base credit.
- $29,047: Statutory single income threshold for the 2026–2027 benefit cycle (up from $28,506 in 2025–2026).
- 0.04: The 4% legislated phase-out rate.
- Complete Cutoff: The credit reaches exactly $0 at an AFNI of $38,497 ($$29,047 + [$378 \div 0.04]$).
Formula for Families (Couples and Single Parents)
$$\text{Gross OSTC} = \$378 \times (N_{\text{adults}} + N_{\text{children}})$$
$$\text{Clawback} = 0.04 \times \max(0, \text{AFNI} - \$36,309)$$
$$\text{Net Annual OSTC} = \max(0, \text{Gross OSTC} - \text{Clawback})$$
Where:
- \(N_{\text{adults}}\): 1 for a single parent; 2 for a married or common-law couple.
- \(N_{\text{children}}\): Number of eligible dependent children under 19 years old.
- $36,309: Statutory family income threshold for the 2026–2027 benefit cycle (up from $35,632 in 2025–2026).
- 0.04: The 4% legislated phase-out rate.
Current OSTC Factors and Benefit Rates
The table below summarizes the statutory rates and thresholds governing the active benefit cycle (July 2026 to June 2027, based on 2025 tax returns) compared to the prior benefit year:
| Parameter / Category |
2025–2026 Benefit Year |
2026–2027 Benefit Year |
Annual Indexation Change |
| Credit per Adult |
$371 |
$378 |
+$7 (+1.9%) |
| Credit per Child (<19) |
$371 |
$378 |
+$7 (+1.9%) |
| Single Income Threshold |
$28,506 |
$29,047 |
+$541 (+1.9%) |
| Family Income Threshold |
$35,632 |
$36,309 |
+$677 (+1.9%) |
| Phase-Out Clawback Rate |
4.0% |
4.0% |
Maintained at 4% |
| Single Full Cutoff Point |
$37,781 |
$38,497 |
+$716 |
| Couple (No Kids) Cutoff |
$54,182 |
$55,209 |
+$1,027 |
| Family of 4 Cutoff |
$72,732 |
$74,109 |
+$1,377 |
Factors That Affect the Calculation
Several life events and financial variables can alter your results on the Ontario Sales Tax Credit OSTC Calculator:
| Factor |
Statutory Rule |
Practical Impact on Payment |
| Birth of a Child |
Children under 19 qualify for the per-child credit ($378). |
Increases your family base entitlement by $378 per child and extends your phase-out ceiling. |
| Marital Status Transition |
Shifts filing status from single to family. |
Raises your income threshold from $29,047 to $36,309, but pools both partners' incomes. |
| Child Turning 19 |
A dependent who turns 19 during the year becomes an independent claimant. |
The parent loses the $378 child addition, but the 19-year-old can file their own return to claim $378. |
| RRSP Deductions |
Lowering Line 23600 Net Income on your federal return. |
Reduces AFNI, protecting your credit from the 4% clawback and restoring lost benefits. |
| Provincial Relocation |
You must be an Ontario resident on the 1st of each payment month. |
Moving to another province terminates remaining monthly payments for the year. |
Examples To Understand OSTC Calculation
The following worked examples demonstrate how the calculator processes figures for different family situations under 2026–2027 rules.
Example 1: Single Adult with Modest Income
Nathan is a 24-year-old line cook living in Kingston with single status and no dependents. His 2025 Line 23600 Net Income was $31,500 (no UCCB/RDSP adjustments).
Determine Gross Base Entitlement:
As a single individual, Nathan's base credit is $378.
Evaluate Against Single Threshold ($29,047):
$$\text{Excess Income} = \$31,500 - \$29,047 = \$2,453$$
Calculate the 4% Clawback:
$$\text{Clawback} = \$2,453 \times 0.04 = \$98.12$$
Compute Net Credit:
$$\text{Net Annual OSTC} = \$378 - \$98.12 = \mathbf{\$279.88}$$
If Nathan has no other Trillium credits, his annual entitlement of $279.88 is under $500, meaning he receives the entire $279.88 as a single lump-sum payment in July 2026.
Example 2: Family of Four with Partial Phase-Out
David and Emily are a married couple and live in Barrie with their two dependent children, aged 6 and 9. Their combined 2025 Line 23600 Net Income was $48,000.
Determine Gross Base Entitlement:
- David (Adult): $378
- Emily (Spouse): $378
- Child 1: $378
- Child 2: $378
- Total Base Household Credit: \(\$378 \times 4 = \mathbf{\$1,512}\)
Evaluate Against Family Threshold ($36,309):
$$\text{Excess Income} = \$48,000 - \$36,309 = \$11,691$$
Calculate the 4% Clawback:
$$\text{Clawback} = \$11,691 \times 0.04 = \$467.64$$
Compute Net Credit:
$$\text{Net Annual OSTC} = \$1,512 - \$467.64 = \mathbf{\$1,044.36}$$
Because their net annual entitlement exceeds $500, the family receives $87.03 per month on the 10th of each month from July 2026 through June 2027.
Maximum OSTC Entitlement by Household Composition
The table below illustrates maximum potential annual credits and phase-out cutoffs across various family structures for the 2026–2027 benefit cycle:
| Household Composition |
Number of Credits |
Maximum Base Credit |
Income Phase-Out Threshold |
Complete Cutoff Point |
| Single Adult (No Children) |
1 |
$378 |
$29,047 |
$38,497 |
| Single Parent (1 Child) |
2 |
$756 |
$36,309 |
$55,209 |
| Single Parent (2 Children) |
3 |
$1,134 |
$36,309 |
$64,659 |
| Married / Common-Law (No Children) |
2 |
$756 |
$36,309 |
$55,209 |
| Married / Common-Law (1 Child) |
3 |
$1,134 |
$36,309 |
$64,659 |
| Married / Common-Law (2 Children) |
4 |
$1,512 |
$36,309 |
$74,109 |
| Married / Common-Law (3 Children) |
5 |
$1,890 |
$36,309 |
$83,559 |
⚠️ This calculator provides estimated Ontario Sales Tax Credit (OSTC) amounts for informational purposes only. Actual benefit amounts are determined by the Canada Revenue Agency based on your tax return and completed ON-BEN Application Form. This tool uses the official OSTC calculation rules and maximum amounts for the 2026 benefit year (July 2026 – June 2027) but should not be considered as official confirmation of benefit amount. Always verify with the CRA or consult a qualified tax professional.
❓ FAQ
What is the Ontario Sales Tax Credit (OSTC)? ▼
The OSTC is a tax-free payment to help low- to moderate-income Ontarians with the sales tax they pay. It is part of the Ontario Trillium Benefit (OTB).
Who is eligible for the OSTC? ▼
You must be an Ontario resident, meet age/parental requirements (19+, or have a spouse, or be a parent), and file your income tax return.
How much can I receive from the OSTC? ▼
For 2026, you can receive up to $378 for yourself, plus up to $378 for your spouse or common-law partner, and up to $378 for each dependent child under 19.
How is the OSTC calculated? ▼
The credit is reduced by 4% of your adjusted family net income over the applicable threshold. For single individuals with no children, the threshold is $29,047. For families, the threshold is $36,309. Senior families may use the higher $37,273 threshold.
Does the seniors' income threshold apply to OSTC? ▼
Yes. If you or your spouse/common-law partner is 64 years old or older on December 31, 2025, AND you are married/common-law OR have a qualified dependant, the higher seniors' threshold of $37,273 applies for the 2026 benefit year.
Does the OSTC affect my GST/HST credit? ▼
No. The OSTC does not affect your GST/HST credit payments. You can receive both credits.
When are OSTC payments made? ▼
If your total OTB entitlement exceeds $500, you receive monthly payments from July 2026 to June 2027 (or a single lump sum in June 2027). If $500 or less, you receive a single payment in July 2026.
What if my OSTC is between $2 and $10? ▼
If your total OSTC is more than $2 but less than $10, it is increased to $10. If it is $2 or less, no payment is issued.
Who receives the OSTC if I'm married? ▼
Only one spouse is eligible for the OSTC. The credit is paid to the spouse whose T1 return is assessed first. If one spouse is a senior, the senior spouse may become the eligible recipient once their return is assessed.
Does age change my OSTC amount? ▼
Age does not change the per-person $378 amount. However, seniors (64+) who are married/common-law or have dependants may benefit from a higher income threshold ($37,273 vs $36,309), which means they can earn more before the credit begins to reduce.
