TaxJar

Just sync your Amazon account with the TaxJar software and you're done!
When you enter all the necessary information, TaxJar essentially does all the work for you. Even if you're not sure which product tax code is correct, the service has a smart product classification feature that offers codes so you don't have to dig around. And if you don't sell on Amazon, eBay, Shopify, Stripe, PayPal and find that your platform is unavailable, TaxJar lets you export your sales data to a CSV file so that you can still get your taxes.
This should give you more confidence that large companies like Microsoft, Eventbrite, Coca-Cola and others are using TaxJar. But just because heavy hitters are associated with it doesn't mean you'll pay through the nose.
Their starter plan is just $19 a month (based on monthly orders), while the Professional Plan is $99 a month (based on monthly orders) for a ton of extra features — and both offer a 30-day free trial and a setup period.
Taxify

The main advantage is that if your company is affected by Covid-19, you may be eligible for free application support.
In addition, some of their main features include software for selling and using taxes for any filing method in any jurisdiction; software for electronic invoicing with compliance in more than 60 countries; software for VAT and fiscal reporting so that you are always up to date with the rules; and software for reporting tax information that simply makes your life easier and cheaper.
Prices are $ 47 per month for the Starter Plan, $97 per month for the standard plan, or $247 per month for the premium plan, and you start with a 30-day free trial.
A2X Accounting

A2X Accounting as one of the best tax software options for Amazon sellers.
Let's start with their ecommerce-specific tax options. If you sell on Amazon or Shopify, there are special tax solutions for each platform to ensure that you register everything correctly. For those with more know-how, who are used to the nuances of taxes, there is an A2X expert who can handle your broader needs. And when it's time to actually file taxes, you can combine A2X with another tax filing tool (like Xero or Quickbooks) to automate everything.
For a limited time, you can save 50% on Xero and A2X for Shopify. Otherwise, the plans are $19 / month for Mini, $39/month for Basic, $69/month for Professional, or $99/month for Advanced. And, of course, you can test any plan that suits you for a free trial.
SimplyVAT

For European sellers, determining VAT based on specific products and countries can be a hassle. This is where SimplyVAT comes in handy, which calculates how much VAT you owe both on individual accounts and in general. But even more carefully, they start you off with a free VAT compliance check (cross-referencing your products to the countries where VAT is charged) to see if you need to pay VAT at all.
If you are based in Canada, New Zealand, Australia or South Africa, SimplyVAT also has something for you, as you can sell in countries where there is VAT. No matter where you live, they will file monthly, quarterly, or yearly (depending on what is required), so you don't have to worry about the details.
Plan prices vary depending on the size of your business, product inventory, and other factors, so email or call them for an accurate quote. But if you want them to take care of your one-time VAT registration, it's only $470.
Avalara

If you need a super fast solution, Avalara is a tax compliance software that lets you enter numbers and figures and file your taxes right away. But if you want to make sure you have everything right, they also have a manual option. You would fill out the appropriate fields and then hand your form over to their experts for them to do a final check before submitting. This is a good option if you are not at all sure about the tax laws and regulations in different countries.
As a quick overview, Avalara allows you to file taxes on goods and services, Communication Tax, Value Added Tax( VAT), Excise tax, and more. And not only is it compatible with any Amazon marketplace, but you can also use it for other platforms like Walmart, eBay, and Etsy.
Plans start at $ 50 a year for small businesses, but there are big discounts everywhere. When you subscribe to Avalara AvaTax, AvaTax and Returns, or Avalara CertCapture, you get 15 months of service for the price of 12 months. And if you need to use AvaTax Cross-Border or Avalara Consumer Use, they will drop 15% of your annual fee for the first subscription period.