I'm single owner of DE LLC, non-resident and I need help with the first time tax preparation.

Regarding US taxation of internet sales. Since you are a foreign entity or person (in regard to the US), and there is an income tax treaty between Canada and the US, you will not be liable for US federal income tax on internet sales unless you have a “permanent establishment” in the US with which the internet sales income is effectively connected. So as long as you do not have a warehouse, physical store, sales office, etc... in the US you don't have to file US returns or remit tax to the US. Amazon should be charging to the customer and withholding any sales tax due to a state in which your products are sold. If you sell through other merchants or directly you may have to deal with this yourself. Regarding incorporation Incorporation is almost always a good idea from a liability standpoint as it prevents a judgement for damages from taking all your property and limits the collection to what is owned by the business, With the facts you have given I would suggest incorporating in Canada unless you have a business reason to establish a physical presence in the US. This will eliminate US taxes and related compliance costs. Once you establish a US presence you will need to begin filing returns in the US even if you are running a net operating loss. If there is no benefit to having a physical presence in the US then the related compliance costs and tax would be an unnecessary expense. Feel free to setup a phone call if you would like to chat for a bit regarding the matter. Thanks

First I'm lot a tax attorney or even know anything about Malaysian tax law. I'm however a person that has moved around a lot and have encounter this situation before. You will must likely have to declare your US income in your home country. However some local tax laws allow for a deduction of foreign tax paid at source. I have not found a US tax treaty between US and Malysia but you should contact a local tax attorney or the tax agency there and ask if they allow deductions or exemptions for foreign tax paid at source. If they do, you would declare your income and deduct the amount of tax already paid to the US. You may or may not still be liable for additional tax on that income. Again it depends on local tax rates and policies. It's never a good idea to hide income from your tax agency though.

The income should be reported by the individual or business that provided the service and earned the income. If the 1099 is in your name, you could ask the issuing Company to change to the S-Corp if that is who earned the income. In the future, have a written agreement between your S-Corp and the Company you are providing service. Also, provide them with a Form W9, so they know where to report the 1099 income at year end.

Same as any other entity (or person). Entity pays taxes in it's domicile jurisdiction. Best you talk with a tax preparer in your home country to ensure you have all the details. And... If you're a US citizen + your SAAS company is generating massive cash, likely best to organize your entity in a low tax jurisdiction, like Bermuda which is home to Google, Intel, Verizon, etc. And... best wait till Trump's new tax bill passes. If he has his way, corporate taxes may drop to a point low enough to keep your business in the US.

I will answer this is the simplest form I can. Basically in every country to conduct business in you will need to pay taxes in that country. If you have an office, employees or your revenue comes from that country you have to pay taxes. These taxes will include State, Federal and Sales Tax. Moreover, this at the beginning will make you think you are paying double tax since this income also has to be paid with your local government, but it isn't so bad. This could be a great opportunity to build a tax strategy where you can take advantage of multi country taxation which can lower your overall tax bracket. There are several steps you have to do to conduct business in the US, such as incorporating first as a foreign corporation in the state you chose (Preferably one with no state tax) then filing your taxes. Your tax preparer in Canada will have to take this in consideration since there are forms he has to fill out to cancel either you Canadian Income Tax or your US tax preparer to fill out the return not to pay taxes here but in Canada... whichever tax you have to pay depending on the international treaties they have.