Sales Tax Filing• California CDTFA & Multi-State
State Sales Tax Calculation & 100% Timely E-Filing
Accurate calculation and electronic filing of California CDTFA and multi-state sales & use taxes. We eliminate 10% late filing penalties and resolve Economic Nexus thresholds.
Amazon & E-Commerce Sellers
Online sellers with nationwide US customers requiring state-by-state sales tax reporting.
E-CommerceRetail & Restaurant Business Owners
Brick-and-mortar stores and restaurants filing regular CDTFA sales tax returns.
Retail StoreMulti-State Expansion Corporations
Businesses exceeding $100,000 out-of-state sales triggering Economic Nexus compliance.
Multi-State NexusExceeding $100k sales or 200 transactions out-of-state triggers Economic Nexus filing requirements even without physical locations.
Official state electronic filing receipts and confirmed tax remittance payment confirmations delivered immediately.
Key Features & Core Benefits
Strict IRS compliance and maximum refund accuracy.
State-by-State Economic Nexus Audit
Evaluating out-of-state sales thresholds to determine Economic Nexus filing obligations.
California CDTFA & District Tax Calculation
Calculating local district tax additions accurately matching California CDTFA rate schedules.
Official State E-Filing & Tax Remittance
E-filing sales tax returns and remitting collected tax funds directly to state portals.
Resale Exemption & Certificate Verification
Categorizing wholesale tax-exempt sales supported by valid resale certificates.
Penalty & Interest Avoidance Shield
Managing strict monthly/quarterly filing calendars to avoid 10% late filing penalties.
Sales Tax Audit Defense Record Preservation
Archiving sales registers and merchant processing records for 4 years to defend state audits.
Simple 4-Step Process
Track your filing progress transparently online.
Sales Data Collection
Gathering sales reports from Amazon, Shopify, and POS systems for the period.
District & Taxable Sales Audit
Categorizing taxable gross sales, exempt wholesale, and local district tax rates.
CPA Return Review & Approval
Bilingual CPA cross-checks tax returns and confirms final tax remittance totals.
CDTFA & State E-Filing Complete
Executing official e-filing with CDTFA and state revenue departments with receipts.
Frequently Asked Questions
Find clear answers to common questions about filing US taxes with TPT Tax.
Real Reviews from Satisfied Clients
Read authentic, verified 5-star reviews from clients who trusted TPT Tax with their US filings.
sarah
04/19/2026
It explains and solves what I want to know in a very easy and clear way.
Joshua Lee
12/19/2025
Very reliable tax service. Received a hefty tax return with their help. Highly recommend.
Terry Kim
08/24/2025
Top Priority filed my tax return from the last year. I'm very satisfied his services and explanations. Mr. Shin made us understanding my situation and was able to prepare the next year tax plan. I definitely recommend my friends and neighbors. Go and try him!!!
Mee Sun Kim
07/30/2025
CPA, Rev. Lee was very fast and kindness. Satisfied!!
terri ong
05/11/2025
Excellent customer service and support. Very knowable ! …
Sydney Joo
05/06/2025
Thank you for your informative seminar.
Kevin Kim
04/28/2025
I attended tax seminar and get good feedback. I strongly recommend.
Deogsoon Jeong
02/24/2025
Very friendly and cheap solution to my tax problem
Grace Lee
10/05/2024
Very professional, knowledgable, with quick turnaround times. Will definitely be coming back next time
Kevin Han
07/13/2024
Top priority tax and the accounting is the place to go to do your taxes. Mr. Shin is so helpful throughout the whole process. I highly recommend using this service for your tax and accounting needs.
Sarah Jow Han
07/10/2024
Best service!! Mr. Shin has the utmost integrity, is very skilled, knowledgeable, and patient. He is amazing, so fast, honest, and hardworking. I think everyone should come here. Highly recommend!!
Connie Kim
05/05/2024
The tax accountant provides quick, professional service and is extremely knowledgeable and informative. Despite my walk-in appointment on short notice, he took the time to thoroughly explain everything and share valuable insights. I highly recommend him to anyone in the Orange County area.
P J
04/29/2024
This company handled all my matters very accurately and promptly.
Jay Yoon
04/02/2024
Mr. Shin is very kind and helpful. He is a professional cpa and knowledgeable.
Joyce
12/29/2023
I did my tax return here, and you helped me quickly, quickly, and very kindly! I'll take good care of your tax report. I strongly recommend it!
Eugene Choi
12/01/2023
The service was phenomenal and Mr.Shin was so helpful throughout the whole process. Prices are really great and I can promise Mr.Shin puts his whole heart into his work. I highly recommend this service to everyone!!
File State Sales & Use Taxes On Time
Accurate CDTFA and multi-state sales tax calculation and e-filing preventing late penalties.