Yes. You can deduct expenses connected with installing a security camera for a customer.
You have an LLC but you did not say whether you are filing an LLC return for a partnership or corporation, or whether you are a single member LLC filing as a sole proprietor. Deduct your expenses on whatever form you are reporting your income on.
Payments received in 2021 are included in next year’s income if you are a cash basis taxpayer. If you use the accrual method, it may be different. Most taxpayers are cash basis.
Under the accrual method of accounting, you generally report income in the year it is earned (rather than paid) and deduct or capitalize expenses in the year incurred. The purpose of an accrual method of accounting is to match income and expenses in the correct year.
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