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View detailsGrand Rapids and the credit union advantage
Lake Michigan Credit Union was founded in 1933 during the depths of the Great Depression, when banks across Michigan were failing and depositors were losing everything. A group of Grand Rapids residents pooled their savings to create a member-owned financial cooperative — an institution that existed to serve its members rather than generate returns for shareholders. That structure hasn't changed in over 90 years.
Today LMCU is the largest credit union in Michigan and one of the largest in the Midwest, with over $12 billion in assets and more than 500,000 members. The credit union operates branches across western Michigan, from Grand Rapids and Kalamazoo to Traverse City and the Lake Michigan shoreline communities.
Routing number
LMCU's routing number is 272479663. The 272 prefix identifies the Federal Reserve Bank of Chicago's Detroit branch. This number applies to all LMCU accounts for ACH transfers, direct deposits, bill payments, and incoming domestic wire transfers. LMCU also participates in the CO-OP shared branching network, giving members access to thousands of credit union branches nationwide — useful for members who joined for Max Checking but live outside Michigan.
Max Checking
LMCU's signature product is Max Checking, a high-yield checking account that has consistently offered APY rates far above the national average — often 3% or higher on balances up to $15,000. Members must meet monthly requirements to qualify: a minimum number of debit card transactions, enrollment in e-statements, and at least one direct deposit or automatic payment. These requirements ensure active account usage, which generates the interchange revenue that funds the higher rate.
The product has earned LMCU a following well beyond Michigan. It's regularly recommended on forums like Bogleheads and r/personalfinance as one of the best checking account yields available anywhere — unusual national visibility for a credit union based in western Michigan.
What member-owned actually means
Credit unions are cooperatives. Every depositor is a member and an owner, and profits are returned in the form of lower loan rates, higher deposit yields, and reduced fees. LMCU doesn't have shareholders demanding quarterly earnings growth, which means it can price products more favorably than publicly traded banks. Mortgage rates typically run 10 to 25 basis points below comparable bank products in the Michigan market, and auto loan rates consistently rank among the lowest in the state. The trade-off is a smaller branch network and less sophisticated digital tools than national banks, though LMCU has invested in mobile banking in recent years.
High-yield accounts are great — until your business outgrows them
LMCU's Max Checking is genuinely one of the best consumer products in banking. But businesses need more than a high APY — corporate cards with per-employee spend limits, automated expense categorization, and financial tools that integrate with their accounting stack. Slash is purpose-built for business banking, providing the operational infrastructure that helps finance teams manage spend across an organization, not just earn interest on idle deposits.
