If your Shopify store was not charging sales tax correctly, your business may still owe the uncollected tax, plus penalties and interest. Incorrect Shopify sales tax settings are one of the most common ecommerce compliance issues, especially for businesses selling across multiple states.
This is one of the biggest risks for ecommerce businesses because:
- Shopify calculates tax based on your settings
- Incorrect settings often lead to under-collection
- Businesses may not realise there is a problem until much later
In most cases the seller, not Shopify, is responsible for sales tax compliance.
The most important point to remember is that if your Shopify store was not charging sales tax correctly, your business may still owe the unpaid sales tax, even if you never collected it from customers.
Why Shopify Sales Tax Problems Are So Common
Many Shopify businesses assume the platform fully handles sales tax compliance automatically.
In reality Shopify provides tax calculation tools
But businesses must still:
- Register correctly
- Configure settings properly
- Monitor nexus obligations
- Apply the correct tax treatment
Shopify helps calculate tax but it does not replace a sales tax strategy.
Common Reasons Shopify Stores Charge Sales Tax Incorrectly
1. Nexus Thresholds Were Crossed Without Updating Settings
This is extremely common.
Businesses may:
- Start selling nationwide
- Exceed economic nexus thresholds
- Continue collecting tax only in their home state
This creates under-collection exposure in other states.
2. Shopify Tax Settings Were Misconfigured
Examples include:
- Wrong states activated
- Incorrect product taxability settings
- Shipping tax settings errors
- Exemptions applied incorrectly
Small setup mistakes can create large liabilities over time.
3. Marketplace Sales Were Not Considered Properly
Businesses selling through:
- Shopify
- Amazon
- Etsy
They may misunderstand:
- Which sales count toward nexus thresholds
- Which platforms collect tax
- Which obligations still remain
Marketplace facilitator rules often create confusion.
4. International Businesses Did Not Realise US Sales Tax Applied
Many overseas Shopify sellers assume US sales tax only applies to US companies. But economic nexus rules also apply to foreign businesses selling into the US.
5. Tax Was Not Applied to Shipping Correctly
Some states:
- Tax shipping charges
- Others do not
Incorrect shipping configuration is a major source of sales tax errors.
How States Identify Shopify Sales Tax Problems
States increasingly use automated systems and third-party reporting to identify businesses with potential under-collected sales tax.
This includes:
- Shopify sales data
- Payment processor reports (1099-K)
- Marketplace reporting
- AI-driven compliance systems
States can often identify the below without conducting a traditional audit first:
- Businesses exceeding thresholds
- Missing registrations
- Inconsistent filings
What Happens If Sales Tax Was Under-Collected?
If a state determines your Shopify store should have collected more sales tax, the state may assess the liability directly against your business.
This can include:
- Unpaid sales tax
- Interest
- Penalties
The most important issue is businesses often cannot recover the missing tax from past customers. This means the business may need to pay the liability itself.
What Should You Do If Shopify Was Set Up Incorrectly?
Step 1: Identify Where You Have Nexus
Review:
- Sales by state
- Inventory locations
- Marketplace activity
Determine where obligations exist.
Step 2: Review Shopify Tax Settings
Check:
- Active states
- Product taxability
- Shipping tax treatment
- Marketplace settings
Errors here are often the root cause.
Step 3: Assess Historical Exposure
Determine:
- When nexus began
- Whether tax should have been collected earlier
This is critical before making registration decisions.
Step 4: Avoid Panic Registration
Immediately registering without reviewing exposure can:
- Complicate voluntary disclosure opportunities
- Increase historical liability risk
Strategy matters.
Step 5: Correct Settings Going Forward
Once obligations are understood:
- Configure Shopify properly
- Begin collecting tax correctly
- Maintain filing compliance
Can Historical Sales Tax Exposure Be Reduced?
In many cases, yes. Businesses may be able to:
- Use voluntary disclosure agreements (VDAs)
- Limit lookback periods
- Reduce penalties
The earlier action is taken, the more options usually exist.
Worked Examples
Example 1: Shopify Seller Exceeds Florida Threshold
- Florida sales exceed $100,000
- Shopify only collecting tax in home state
Result:
- Florida sales tax exposure created
- Historical liability begins accumulating
Example 2: Shipping Tax Misconfiguration
- Store sells taxable products nationwide
- Shipping not taxed in states where required
Result:
- Under-collected sales tax identified during review
Example 3: International Shopify Brand
- UK-based Shopify seller
- US sales grow rapidly
- No US sales tax registrations
Result:
- Multi-state nexus exposure identified
- Compliance strategy required
Common Mistakes Shopify Sellers Make
- Assuming Shopify fully handles compliance
- Ignoring nexus thresholds
- Not reviewing tax settings regularly
- Misunderstanding marketplace facilitator rules
- Registering before reviewing historical exposure
These mistakes can create significant long-term liabilities.
FAQs
Does Shopify automatically handle sales tax compliance?
No, Shopify calculates tax based on your settings, but you remain responsible for compliance.
Can I owe sales tax if Shopify didn’t charge it?
Yes, states may still assess the unpaid tax against your business.
How often should Shopify tax settings be reviewed?
Regularly, especially as your business grows into new states.
Can Shopify tax settings be wrong even if tax is being charged?
Yes, incorrect rates or missing states are common issues.
Can penalties be reduced if mistakes already happened?
Often yes, especially through voluntary disclosure strategies.
Final Thoughts
Incorrect Shopify sales tax settings are one of the most common compliance issues facing ecommerce businesses today.
The key takeaway is if your Shopify store was not charging sales tax correctly, your business may still owe the missing tax, even if customers were never charged.
As ecommerce businesses scale across multiple states, proactive sales tax management becomes essential to:
- Reduce financial exposure
- Avoid audit risk
- Stay compliant long-term
If you think your Shopify store may not have been charging sales tax correctly, RJM Tax Exemption can help review your nexus exposure, assess historical liability, and ensure your Shopify tax settings are configured properly moving forward.
