Your monthly budget in Tulsa.

Tulsa was once called the “Oil Capital of the World,” and the city still carries the habits of a place that has seen sharp swings. Texaco and other oil companies moved their headquarters to Houston in the 1950s, and a 1982 oil-price collapse hit Tulsa especially hard. The city has since diversified, with finance, aviation, telecommunications and technology now leading, according to its Wikipedia profile. For the reader looking for a budget app for managing money in Tulsa, the lesson is practical: plan around the weakest year you can imagine, and treat the good years as extra. Monthly is a free, manual app that does that arithmetic with income, fixed expenses and a weekend reserve.

The hangar is the city’s biggest paycheck story

American Airlines moved its entire fleet to Tulsa by 1950, after taking over a former Douglas Aircraft facility in 1946. Today the airline’s maintenance base, Tech Ops-Tulsa, sits on 246 acres at Tulsa International Airport, with roughly 5,000 employees and about 400 aircraft visiting each year, according to trade reporting, and the mayor has described it as the largest commercial aviation maintenance base in the world. About 740 people work in the engine shop alone.

Maintenance work comes with a typical shape: scheduled shifts, differentials for nights and weekends, and overtime when aircraft stack up. That is a middle-income paycheck with moving parts. The first rule for anyone on that kind of schedule is to separate what is guaranteed from what is not.

Worked example: an aircraft mechanic with overtime

Hypothetical numbers. A mechanic takes home $3,700 in base pay and about $600 more in overtime in a typical month, for $4,300. Fixed expenses are a mortgage at $1,180, a truck payment at $520, utilities at $230, a phone at $70 and home and auto insurance at $260, for $2,260. The weekend reserve is $250.

Base pay only: $3,700 minus $2,260 minus $250 equals $1,190.

With overtime: $4,300 minus $2,260 minus $250 equals $1,790.

The $600 of overtime is not part of the plan; it is what the plan does with a good month. Using it to cut a truck loan balance, build a repair fund or cover property tax is a choice. Spending it by default is how a household ends up relying on hours it doesn’t control.

Look at your own pay stub through this lens. Split your base pay from your overtime and see which one your mortgage depends on →

Worked example: one income lost

Hypothetical again. A two-earner household takes home $5,600. Fixed expenses are $3,150 and the reserve is $300.

Both jobs: $5,600 minus $3,150 minus $300 equals $2,150.

If one job disappears and $2,900 remains: $2,900 minus $3,150 minus $300 equals minus $550.

The shortfall tells the household two things. A layoff would leave a $550 monthly gap even without a reserve, and trimming the reserve to zero leaves a $250 gap. Neither fact is comfortable, but both are better known in advance. A city that went through 1982 has long memory for why this exercise matters.

A city of oil, then something else

The oil legacy is still part of Tulsa’s identity, and Wikipedia notes that businessman Cyrus Avery founded the U.S. Highway 66 Association in Tulsa in 1925, earning the city the nickname “Birthplace of Route 66.” The 2020 census counted 413,066 residents, making Tulsa Oklahoma’s second-largest city, with a metro population of 1,034,123. A diversified economy is more stable than a single-industry one, but households can still rely too heavily on one employer. Enter each earner’s pay as a separate income line.

Storms and floods

Tulsa has seen tornadoes, including an EF2 on August 6, 2017, and others in December 1975 and December 1982. A stalled front caused a flood in 1984 that killed 14 people. Those are historical facts, not predictions, but they point to a budgeting habit: know your deductibles. Check whether your homeowner’s or renter’s policy has a separate wind and hail deductible, and divide the amount by twelve for a monthly fixed line.

Car-first living

Tulsa is spread out and most households rely on cars. A mechanic driving to the airport, a nurse crossing town and a student commuting to class all need fuel, insurance and maintenance. Keep them on separate lines so you can see which one moved. A repair line, however small, makes a $600 bill feel like a planned expense.

Weekends

Tulsa’s weekends run from Route 66 diners to concerts, ball games and the Gathering Place, a large park in the city’s Midtown. Many of them are cheap. Some are not. The weekend reserve is a number you commit to before Friday. If a game and a family dinner push it up, raise it for that weekend and see the effect on the month.

Money owed and retirement notes

Coworkers who carpool, relatives who borrow for a transmission: the money owed list keeps the name, the amount and the expected date for anything others owe you. A 401(k) from the hangar, an older pension or a plain savings balance can each be a line in the investments list, with the day you looked at it. Because the app does not link to accounts, the numbers are only as current as your last visit, and that is the point: it is a notebook, not a feed. It offers no advice on where savings should sit.

Learning the shape of your year

Industrial and aviation shops have rhythms: a heavy maintenance season, a quiet stretch, a month of mandatory overtime. After three or four months of entries, Monthly shows the shape of your own year, and the heavy months can be put to work for the light ones. Enter the real figures, not the hoped-for ones, and resist averaging in a rumored raise or a promised shift. A plan that survives the dull months does not need the busy ones to be exceptional, and it makes any extra hours feel like what they are: a bonus.

The habit worth having

Check real free money once a week, on the same day. Enter any new income, update any bill that changed and see whether the month still fits.

This week

Open Monthly, enter your base paycheck, the fixed bills and a reserve you can keep. Then add overtime as a separate line. Run one household income through the fixed bills and see what a layoff would leave →