"tool payments" are never a write-off.
If your spouse is a W-2 employee, their job expenses are not deductible for 2018-2025 due to the tax reform law. You can enter them in Turbotax, because they may be deductible in some states.
If they are self-employed/independent contractor, work expenses are deductible on schedule C.
But what is actually deductible? Tools with an expected life of more than 1 year are assets. Assets must generally be depreciated over their expected life, that means deducting the cost over time, not all at once. For items with an individual cost less than $2500 each, you can choose a "safe harbor" to treat them as expenses and take the entire deduction the year the tools were purchased.
However, the cost for either depreciation or the safe harbor is the cost of the tool when it is placed in service with the business, even if the cost is not paid up front. That means if you buy a $1000 Snap-on socket set for $10/week for 3 years, you list the item as an asset with a cost of $1000 and take the entire $1000 as depreciation or as safe harbor, even though it isn't paid for yet. Then in subsequent years, you can deduct the interest (if you pay interest) but you can't deduct the entire "tool payment" because you already deducted or depreciated the tool at its purchase price. (Items more than $2500 are placed in service as assets at their actual cost and depreciated over time, most commonly 5, 7 or 10 years. You can include interest as an ongoing deductible expense but not the entire payment, because you already listed the item as an asset at it's full cost.)
Also note that because the tool is deducted or depreciated fully, its adjusted cost basis is zero. That means that if you later sell it, the selling price is taxable business income, since you are recovering money you previously deducted. This is called depreciation recapture.
