Why was only 703 deposited into my account when my refune was 876?

Here's one possible explanation:

Are you speaking of a Federal refund?   Did you choose to pay any TurboTax fees out of your Federal refund instead of paying upfront with credit/debit card?  If so, in addition to the product fees that payment method also has a $40 service fee ($45 for California filers.)

Also, if you are due a state tax refund, it comes separately in a different deposit.

See this TurboTax support FAQ if your federal tax refund is less than expected - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-refund/refund-direct-deposit-check-lower-amount-turbotax/L4D3L1d96_US_en_US?uid=lwy89fhy