Sales Tax Filings
Stress-free sales tax filings, done right every time.
Managing sales tax can be one of the most time-consuming and confusing parts of running a business, with each state and locality having its own rules, deadlines, and filing requirements. At Portside, we simplify the process by handling your sales tax filings with precision and consistency, so you never have to worry about missed deadlines or costly errors. Whether you operate in one state or across multiple jurisdictions, our experienced team ensures your filings are accurate, compliant, and submitted on time. With our guidance, you can focus on growing your business while we take care of the details that keep you in good standing with tax authorities.
Who This Is For:
- Businesses filing sales tax in one or more states
- Nonprofits filing sales tax in one or more states
- Organizations that need to register to remit sales tax
- Organizations that need help with their sales tax filings
Why Choose This Service
Multi-state & multi-jurisdiction capable
IRS-licensed Enrolled Agents (EAs)
Filing deadline monitoring
Nexus and registration guidance
Tax notice & correspondence assistance
100% online process - no office visits
Ongoing compliance
Easy-to-use online portal and mobile app
What's Included
Expert Prep & Filing of State Sales Tax Returns
We ensure every return is prepared correctly to prevent errors and penalties.
Multi-State & Multi-Jurisdiction Support
Our team manages filings across all states and localities where your business operates.
Monitoring of Filing Deadlines
We track deadlines so your filings are always submitted on time.
Detailed Reconciliations
We verify that the tax you’ve collected matches what’s remitted to authorities.
Expert Guidance on Nexus and Registration Requirements
We help you understand where you have sales tax obligations and ensure proper registration.
Sales Tax Notice & Correspondence Assistance
We manage any official communications to resolve issues quickly.
Secure, 100% Virtual Process
You can safely share and submit documents online without hassle.
Ongoing Compliance Monitoring
We stay on top of changing rules so you don’t have to.
Personalized, Expert Advice
We provide tailored guidance to protect your business and reduce risk.
Optional Add-ons
Business Tax Prep & Filing
File your business or nonprofit taxes with confidence through expert preparation, compliance, and strategic guidance.
Ongoing Entity Management & Maintenance
Keep your business in good standing with ongoing compliance monitoring and filings.
Ongoing Bookkeeping & Accounting
Keep your finances organized with reliable monthly bookkeeping and reporting.
State Sales Tax Exemptions
We can assist with sales tax exemption applications in the states your nonprofit organization operates in.
Payroll Services
Simplify payroll with accurate processing, tax filings, and employee compliance.
Merchant Services
Merchant processing services for small businesses. No hidden fees. No long-term contracts. Just honest, transparent pricing — from a firm that already knows your books.
Related Guides
Frequently Asked Questions
Do I need to collect and file sales tax for my business?
Sales tax is imposed by states (and often local governments), not the IRS. Whether you must collect it depends on what you sell and whether you have nexus, meaning a sufficient connection to a state, through a physical presence or economic activity such as sales volume. We review where you sell and tell you where you need to register.
What happens if I miss a sales tax filing?
States generally charge penalties and interest on late or unfiled returns, and sales tax collected from customers is treated as money held in trust for the state. If you have fallen behind, we can help you file past-due returns and explore penalty relief or voluntary disclosure options where available.
How often do I have to file sales tax returns?
Each state assigns a filing frequency, usually monthly, quarterly or annually, based on your expected or actual taxable sales. The state tells you your frequency when you register, and it can change as your sales grow. We track your due dates and file on schedule.
Do I owe sales tax if I sell online to customers in other states?
Possibly. Since the U.S. Supreme Court's 2018 Wayfair decision, states can require out-of-state sellers to collect sales tax once they pass an economic nexus threshold, which varies by state. Marketplace facilitators may collect for you on some sales. We map your sales by state and handle registration and filing.
Professional Resources
Our services are designed to meet professional standards and regulatory requirements. For additional information about tax compliance and best practices, we recommend consulting:
- Internal Revenue Service (IRS) - Official tax information and forms
- American Institute of CPAs (AICPA) - Professional accounting standards
- Small Business Administration (SBA) - Business compliance resources
- IRS Exempt Organizations - Nonprofit tax requirements