The 1% Rule and Other Quick Filters
When you start looking at investment properties, you will quickly realize there are hundreds of listings to sift through. Running a full financial analysis on every single one is not practical. Experienced investors use quick screening filters to eliminate properties that are unlikely to cash flow before spending hours on a deep dive. These rules of thumb are not a substitute for full analysis, but they save you enormous amounts of time.
The 1% Rule Explained
The 1% rule says that a rental property's monthly rent should be at least 1% of the purchase price. If a property costs $200,000, it should rent for at least $2,000 per month. If it costs $150,000, you need at least $1,500 in monthly rent. Properties that meet the 1% rule have a much better chance of producing positive cash flow. In expensive markets like coastal cities, hitting 1% is nearly impossible — properties that cost $500,000 rarely rent for $5,000 per month. In those markets, investors often rely more on appreciation than cash flow, which is a different strategy with different risks. In Midwest and Southeast markets, the 1% rule is more achievable and remains a useful first filter.
The 50% Rule for Expenses
The 50% rule estimates that about half of your gross rental income will go to operating expenses — everything except the mortgage payment. So if a property rents for $1,600 per month, assume $800 goes to taxes, insurance, maintenance, vacancy, and management. That leaves $800 to cover your mortgage payment and provide cash flow. If your mortgage payment is $900, the deal is negative cash flow even before something breaks. This rule is a fast sanity check. Some properties run at 40% expenses, some at 60%, but 50% is a reliable average across a portfolio. If a deal does not work at 50% expenses, it almost certainly does not work in reality.
The 70% Rule for Flips
If you are considering a fix-and-flip rather than a rental, the 70% rule applies. It says you should pay no more than 70% of the property's after-repair value (ARV) minus the cost of repairs. If a house will be worth $250,000 after renovation and needs $40,000 in work, your maximum purchase price is ($250,000 times 0.70) minus $40,000, which equals $135,000. This leaves room for closing costs, holding costs, financing, and profit. The 70% rule is aggressive by design — it builds in a margin of safety for the things that inevitably go over budget or take longer than planned. Many beginners skip this buffer and end up breaking even or losing money on their first flip.
When to Break the Rules
These filters are starting points, not gospel. A property that hits 0.9% might still be a great deal if it is in a rapidly appreciating neighborhood with low vacancy rates. A property that hits 1.2% might be a terrible deal if it is in a high-crime area where tenant turnover is constant and maintenance costs are extreme. Use the rules to narrow your search from 100 properties to 10, then run full numbers on those 10. The filters eliminate the obvious losers so you can focus your energy on the properties that have a real chance of working. As you gain experience, you will develop your own benchmarks based on your market and strategy.
Key Takeaways
- ✓The 1% rule: monthly rent should be at least 1% of the purchase price for likely positive cash flow
- ✓The 50% rule: budget half your gross rent for operating expenses as a quick sanity check
- ✓These rules narrow your search — always run full numbers before making an offer
- ✓Market context matters: rules that work in one city may not apply in another
Want a personalized plan?
HomeIQ Academy builds a learning path based on your situation — credit, income, savings — so you know what to focus on first.
Start Free