Manitoba's combined marginal rate jumps from about 33.25% below $100,000 to about 43.40% above it — an early cliff that makes registered accounts critical for coupon-heavy portfolios. Roughly $12,300 of GIC interest taxed at 43.40% leaves about $6,962 after tax in a non-registered account versus the full $12,300 inside a TFSA, subject to room and CRA rules. Credit Union Central of Manitoba coordinates system liquidity, while Assiniboine Credit Union anchors the largest retail footprint in the province.
Interest is taxed annually at your marginal rate (simplified).
Term
Compare terms at the same rate
Uses your principal, rate, and compounding choice for each term length.
| Term | Maturity | Interest | After-tax total |
|---|---|---|---|
| 1yr | $10,450.00 | $450.00 | $10,315.00 |
| 2yr | $10,920.25 | $920.25 | $10,644.18 |
| 3yr | $11,411.66 | $1,411.66 | $10,988.16 |
| 4yr | $11,925.19 | $1,925.19 | $11,347.63 |
| 5yr | $12,461.82 | $2,461.82 | $11,723.27 |
Maturity value
$11,411.66
Principal vs interest
Educational estimates only. Institutions may compound differently, apply minimums, or use day-count conventions not modeled here. Not financial advice.
Illustration: $50,000 principal, 5-year GIC at 4.5%, ~$12,300 total simple interest; tax applied once on total interest at stated combined marginal rate (simplified).
| Annual Income | Combined Rate | Tax on interest | After-tax interest | After-tax return |
|---|---|---|---|---|
| $60,000 | 33.25% | $4,090 | $8,210 | 3.01% effective |
| $90,000 | 33.25% | $4,090 | $8,210 | 3.01% effective |
| $120,000 | 43.40% | $5,338 | $6,962 | 2.55% effective |
| $150,000 | 43.40% | $5,338 | $6,962 | 2.55% effective |
Manitoba's 43.40% rate above $100,000 means non-registered GIC interest is taxed at one of the highest combined rates in Canada — making TFSA room essential for higher earners.
Assiniboine Credit Union is Manitoba's flagship retail co-operative, pairing ethical-lending branding with competitive posted ladders. Steinbach Credit Union, Cambrian Credit Union, Crosstown Civic Credit Union, and Access Credit Union round out the largest networks. DGCM guarantees qualifying credit union deposits under provincial rules distinct from CDIC bank insurance. Big Six banks and EQ Bank-style digital issuers remain available province-wide for rate shoppers who prefer federal CDIC membership.
GIC interest in a non-registered account is taxed as ordinary income at your combined federal and Manitoba marginal rate — about 33.25% up to roughly $100,000 and about 43.40% above that in these illustrations, among the steepest provincial jumps in Canada.
Manitoba credit union deposits are guaranteed by DGCM (Deposit Guarantee Corporation of Manitoba) with coverage rules that differ from CDIC's $100,000 per insured category model — confirm coverage with your credit union.
Strongly consider it above $100,000: at a 43.40% combined marginal rate you keep roughly 56.6% of GIC interest after tax in a non-registered account versus 100% inside a TFSA in this simplified model.
Assiniboine Credit Union is Manitoba's largest retail credit union with multi-billion-dollar assets; it regularly posts GIC ladders competitive with Big Six specials while carrying DGCM protection — compare posted rates weekly.
DGCM guarantees qualifying deposits at Manitoba credit unions under provincial legislation — read the current DGCM bulletin and your account agreement for coverage limits, eligible products, and exclusions.
Educational estimates only. Not financial advice.