Marietta bookkeeping for businesses moving faster than their financial records can follow.
Gabriel Thomas helps owner-led businesses organize their records, establish dependable bookkeeping routines, and build a clearer financial foundation for what comes next.
GAT LLC is an independent bookkeeping firm led by Gabriel Thomas and serving owner-led businesses in the greater Marietta area. GAT LLC is not affiliated with GAT Accounting and Advisory or with any aviation, construction, or transportation company using the GAT name.
Where are your books today?
When months go unreconciled, every later decision rests on numbers nobody trusts. The first step is a clear picture of what exists, what is missing, and what has to be rebuilt before ongoing work can begin.
Start with a bookkeeping diagnostic, then a defined cleanup and catch-up scope.
The business grew. The bookkeeping process stayed where it was.
Most good businesses begin the same way: an informal spreadsheet, categories decided in the moment, receipts in a truck console or an email folder, and an owner doing the books late on a Sunday.
That works — right up until it doesn't. Transactions multiply. A second account opens. A card gets added for a crew lead. Clients start paying through three different platforms. The early process was never built for that volume, and the records slowly fall behind the reality of the business.
Gabriel's work is bringing the records and the routine back up to the level the business already operates at — so the books describe the company as it is now, not as it was two years ago.
One account, one spreadsheet, categories decided from memory.
Multiple accounts, cards, and payment platforms feeding the same month.
A repeatable process that closes each month the same way.
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A clearer system begins with someone willing to understand how the business works.
GAT LLC is led by Gabriel Thomas. Rather than describing him with borrowed language, this section is reserved for his verified background, in his own words. The items below are confirmation prompts, not claims.
- Official title
- Professional background and career path
- Years of experience
- Education, training, and certifications
- Bookkeeping software experience
- Industries he knows best
- Why he established or leads GAT LLC
- Connection to Marietta and Cobb County
- Any verified history with Thomas Accounting Service
- What 'GAT' stands for, if anything
One service hub. Five ways the work shows up.
GAT LLC is a bookkeeping firm. Components listed on each service are proposed and require Gabriel's confirmation before they are presented as included.
Bookkeeping Diagnostic
A structured look at where the books actually stand before anything is promised.
- Current-book review
- Reconciliation-status review
- Chart-of-accounts review
- Workflow assessment
- Identification of incomplete periods
- Recommended next steps
Cleanup and Catch-Up
Bringing prior periods back to a state the business and its tax professional can rely on.
- Prior-period reconciliation
- Transaction categorization
- Account cleanup
- Opening-balance review
- Correction of bookkeeping inconsistencies
- Preparation for ongoing service
Monthly Bookkeeping
The recurring rhythm that keeps records current instead of reconstructed.
- Transaction recording and categorization
- Bank and credit-card reconciliations
- General-ledger maintenance
- Monthly financial reports
- Missing-document follow-up
- Year-end organization
Bookkeeping Systems
The structure underneath the numbers — built once, followed every month.
- Accounting-platform setup
- Chart-of-accounts design
- Document-collection workflows
- Monthly-close checklists
- Software integrations
- Internal bookkeeping procedures
Reporting and Owner Clarity
Turning a closed month into information an owner can act on.
- Monthly reporting packages
- Revenue and expense summaries
- Cash-position reporting
- Owner review meetings
- Tax-professional coordination
- Identification of unusual activity
Three stages, repeated until they are boring — in the best sense.
Bring the Records Together
Review the current books, accounts, documents, and incomplete periods so the starting point is known rather than assumed.
Build the Monthly Rhythm
Establish repeatable procedures for reconciliations, document requests, and reporting — the same way, every month.
Keep the Business in View
Deliver organized information and clear follow-up so the owner knows what is complete and what requires attention.
How a month moves from activity to useful reporting.
This is an educational view of a well-run monthly close. The exact elements included in a GAT LLC engagement are confirmed with Gabriel during scoping.
Activity from bank accounts, credit cards, and payment platforms is recorded and categorized consistently, so the same kind of expense lands in the same place every month.
Bookkeeping built for the businesses behind Marietta's momentum.
GAT LLC is rooted in Marietta. The firm works with owner-led companies around the Square, along the Cobb Parkway corridor, and throughout Cobb County and its neighboring communities — East Cobb, Smyrna, Kennesaw, Powder Springs, Austell, and Acworth.
Work is handled through secure cloud accounting software, which means a client across the county and a client across state lines follow the same monthly process. Marietta stays the firm's home.
A client journey that is clear from the first message.
- 01Complete a short bookkeeping fit assessment
- 02Schedule a conversation with Gabriel
- 03Receive a diagnostic or scope recommendation
- 04Approve the engagement digitally
- 05Connect accounts through secure software
- 06Follow a customized onboarding checklist
- 07Move into a recurring monthly-close schedule
- 08Receive reports and requests in one central client portal
Account credentials, passwords, and confidential financial documents are never requested by email. Secure connections and the client portal handle that.
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No credentials, reviews, or client outcomes are published here yet, because none have been verified. These placeholders are for the editor — nothing below is a claim.
The business is moving.
The books should know where it is.
Start a conversation with Gabriel about the current state of your records and the bookkeeping foundation your business needs next.
Talk With Gabriel