What Is Estimated Tax Payment Calendar?

There is a paper form 4868 to complete and mail today (penalty may accrue for lateness) to the IRS with if at all possible an estimated payment, while you have 6 months to obtain the W-2 and file your income tax return.

https://turbotax.intuit.com/tax-tips/tax-extensions/reasons-for-filing-for-an-extension-on-your-federal-taxes/L35uL7295

If the Australian TFN, tax file number, is what you are looking for, you can call the ATO directly 13 28 61 and select option 1. Or, look at your tax assessment document which will have the TFN. It would also be on your superannuation statement, as well as on your payment summary from an employer.

Can't find your TFN?

• Look on your income tax notice of assessment or other letters from ATO
• Look on a payment summary (provided by your employer) or your super statement
• If you have a myGov account linked to the ATO, you can access your TFN online
• Ask your tax agent (if you use one)

If you still can't find it, phone the ATO on 13 28 61, 8.00am to 6.00pm, Monday to Friday.
https://www.ato.gov.au/Individuals/Tax-file-number/

Follow the steps to register your business to the Payment Gateway India like PayUmoney for smooth transactions in the future.

• Open a current account in the name of the business.
• Organize the following documents in order.
• Registration papers of Service Tax and Sales Tax.
• If the venture is a company, then you will need a Certification of Incorporation.
• Proof of ID.
• Address proof of the owner of the business and the business if only the two venues are different.
• Recent photographs of the owner or the merchant.
• The business model on your respective letterhead.
• The printout of the Contact, About Page, Terms & Condition, and Pricing Page displayed on the website.
• Agreements related to the Payment Gateway India.

Every document should be properly signed and stamped with the business seal. After acceptance, the gateway will be incorporated in your commercial website.

If you need to pay taxes, read https://www.ato.gov.au/Business/Payments-to-ATO/How-to-pay/

If you need to claim family tax benefit using centrelink, visit http://www.humanservices.gov.au/customer/services/centrelink/family-tax-benefit-part-a-part-b?from=pf

First you have to determine your net income. Net income is your business income less your business expenses. Self employment tax is 15.3% of your net income. As a rule of sum is to consider that 20% of your business income is your personal contribution to Uncle Sam. The determined estimated tax must be paid quaterly.

If you are paying your sales tax by invoice date - the payments will not affect your liablity. ie you owe the whole amount of sales tax as of the date of the invoice. If you are paying sales tax as of the time of payment. You will owe sales tax at the time you receive payment.
Since you are using progress invoicing, the sales tax would be come due at the time of the invoice. If you are just receiving payments, you would receive payments (as you would with any customer, and not invoice until time of completion. You would just need to make sure that your preference for sales tax due date is set to Invoice date, not time of payment.