 
 The simplest setup I have seen stick is a joint bills checking account plus one joint credit card used only for groceries and household supplies. Add autopay to pay the card in full from the joint account and put all fixed bills on autopay from that same account. If you cannot open new accounts right now, just repurpose one existing checking account for bills and pick one existing card to be the joint card. Each of you transfers a fixed percentage of take‑home into the joint account every payday based on your share of total income so it stays fair even with different pay schedules. Quick example: if your combined monthly take‑home is 8000 and the joint bills average 2800, and one of you brings home 5000 while the other brings home 3000, contributions are 1750 and 1050 per month. If paid biweekly, that is about 808 and 485 per paycheck. Leave a one‑month buffer in the joint account so mismatched paydays never bounce a bill.
Keep categories minimal so you do not burn out: Rent, Utilities, Groceries and Household, and Annuals. A shared Google Sheet works fine with columns for Date, Merchant, Category, Amount, and Notes, and you can reconcile in 15 minutes once a week by checking the card statement and the bank's recent transactions. For odd shared costs that do not belong on the joint card, use a shared expense app or a second tab in the sheet to log them and settle monthly by adjusting the next transfer rather than swapping cash. Pitfalls I hit were underestimating groceries, forgetting annuals, and mixing personal spending on the joint card. We fixed them by bumping groceries 10 percent and setting aside a set monthly amount for annuals such as renters insurance and car registration, and keeping separate personal checking accounts for fun money. Revisit the split and the averages every quarter or after a raise, and aim to build the buffer to cover one full month of joint bills so seasonal utility spikes or shipping delays on a replacement card never derail the plan.
 
  
  
  
  
  
  
  
  
  
  
 