To prove travel expenses for taxes, you should keep a record of your expenses, such as receipts, vouchers, and invoices. As a general rule of thumb, don't write off an expense unless you can prove it relates to work.
In short, ing to Massachusetts law, your employer is required to reimburse you for mileage if you drive your car for work purposes during the workday.
You should keep adequate records to prove your expenses or have sufficient evidence that will support your own statement. You generally must have documentary evidence, such as receipts, canceled checks, or bills, to support your expenses.
Whether you lost your receipts, they were damaged, or you simply don't have them, there are several documents you could use as evidence to answer an IRS audit when you have no receipts: Calendar logs of meetings/travel/daily tasks. Canceled checks. Credit/debit card statements.
As a general rule, a taxpayer must maintain adequate records or other sufficient evidence to substantiate expenses claimed. Additional evidence is required for some expenditures or use, such as, travel, entertainment, gifts, and auto expenses.
This travel must be overnight and more than 100 miles from your home. Expenses must be ordinary and necessary. This deduction is limited to the regular federal per diem rate (for lodging, meals, and incidental expenses) and the standard mileage rate (for car expenses) plus any parking fees, ferry fees, and tolls.
A taxpayer is traveling away from home if they are away for longer than an ordinary day's work and they need to sleep to meet the demands of their work while away. Travel expenses must be ordinary and necessary. They can't be lavish, extravagant or for personal purposes.