Financial August: prepare your business before the September estimated tax payment

August may feel like a quiet month for taxes. It is not April, it is not the end of the year, and many people do not think of it as an important tax month. But for self-employed workers, contractors, LLC owners, restaurants, cleaning businesses, landscaping companies, construction businesses, and small business owners, August can be a very important month.

Why? Because the next federal estimated tax payment is normally due on September 15, and that payment is tied to income from the period that includes June, July, and August. The IRS explains that people who need to pay estimated taxes can generally do so quarterly, especially when they have income without enough withholding, such as self-employment or business income.

Important: September is not the month to start searching for receipts, reviewing bank accounts, or guessing your income. September is the month to comply. August is the month to prepare.

1. What are estimated tax payments?

Estimated tax payments are payments many people make to the IRS during the year to cover taxes that are not automatically withheld. This often happens when someone is self-employed, receives contractor payments, runs a business, receives 1099 income, or owns an LLC where business profit flows to their personal tax return.

In simple terms: if nobody is withholding taxes from your payments, you may be responsible for setting money aside and paying during the year.

The IRS explains that self-employed individuals generally file an annual tax return and pay estimated taxes quarterly. They also need to consider self-employment tax in addition to income tax.

Pay attention: just because money enters your bank account does not mean all of it is available to spend. Part of that money may need to be set aside for taxes.

2. Why August matters

August matters because you still have time to review your numbers before the September deadline. Under the IRS general schedule for individual estimated tax payments, the payment for the June-through-August period is normally due on September 15.

That means August should be used to review:

  • How much your business earned;
  • How much you spent;
  • What receipts you have;
  • What estimated payments you already made;
  • Whether your business grew;
  • Whether your next payment should be adjusted;
  • Whether personal and business expenses are properly separated.

Many business owners wait until the last minute. The problem is that when September arrives, there is not much time left to fix mistakes. That is why August is a good time to stop, review, and organize.

3. The mistake of paying “the same as always”

One common mistake is paying the same amount every period without checking whether the business has changed. This may feel convenient, but it is not always accurate.

For example, imagine your business earned a moderate amount last year, but this year you have more clients, more projects, or more sales. If you keep making estimated payments as if your business did not grow, you may end up underpaid.

The opposite can also happen. Maybe your business had slower months, higher expenses, or equipment purchases. In that case, paying without reviewing the real situation may not be the best approach.

Important reminder: growth is good news, but it can also change your tax responsibility.

For a construction business, this may happen when bigger contracts come in. For a restaurant, it may happen when summer sales increase. For a beauty entrepreneur, it may happen when product orders or services grow. For a cleaning business, it may happen when new monthly clients are added.
Growth should be celebrated, but it should also be planned.

4. Your receipts can help more than you think

Many self-employed people focus only on sales or deposits. But to understand the real financial picture, expenses must also be reviewed.

Receipts help support deductible business expenses. Without receipts, it becomes harder to show what you purchased, when you purchased it, and whether it was truly for the business.

In August, review whether you have organized:

  • material receipts;
  • supplier invoices;
  • gas payments;
  • tool purchases;
  • work equipment;
  • business rent;
  • utility payments;
  • insurance;
  • contractor payments;
  • bank statements;
  • sales platform or delivery platform records;
  • advertising expenses.

Pay attention: a lost receipt can become a lost deduction.
This is not about saving paper for no reason. It is about having support, so your numbers better reflect the reality of your business.

5. Do not mix personal and business money

This is one of the most common problems in small businesses. The owner uses the same account for everything: customer deposits, personal purchases, materials, gas, family expenses, transfers, rent, tools, and business payments.

At first, it may feel simple. But when it is time to calculate taxes, everything becomes confusing.

If you do not separate properly, you may struggle to identify:

  • What income truly belongs to the business;
  • What expenses were personal;
  • What purchases may be deductible;
  • How much the business actually earned;
  • How much money should be set aside for taxes.

Important: if your bank account mixes personal life and business activity, your numbers may be telling the wrong story.
A simple practice is to use one business account and one card dedicated to business expenses. It does not need to be perfect from day one, but it does need to start becoming organized.

6. Cash flow matters too

Preparing for an estimated tax payment is not only about calculating taxes. It is also about making sure the business will have enough cash available to pay without hurting operations.

Many businesses have sales, but they do not always have available cash. There may be unpaid invoices, large purchases, payroll, rent, inventory, or material costs.

That is why August should also be used to review cash flow. The question is not only: “How much should I pay?” It is also: “How can I prepare to pay it without affecting my business?”

This applies especially to construction, restaurants, and service businesses, where money can come in and go out quickly.

Pay attention: having sales does not always mean having available cash.
Setting aside part of your income for taxes can help prevent the September payment from feeling like an emergency.

7. What to review before September 15

Before the estimated payment deadline arrives, August is the right time to review key items.

Use this checklist:

  • Income from June through August
    Review deposits, invoices, sales, payments received, and jobs collected.
  • Deductible expenses
    Organize receipts, invoices, and business-related payments.
  • Previous estimated payments
    Confirm whether you made payments in April and June and save confirmations.
  • Bank statements
    Review transactions that need to be classified correctly.
  • Personal vs. business expenses
    Identify purchases that should not be mixed.
  • Business growth
    If you earned more, review whether your estimated payment may need adjustment.
  • Available cash flow
    Make sure money is set aside to pay on time.
  • Documents for your tax preparer or accountant
    Do not wait until the last day to send information.

The IRS provides options to pay estimated taxes online, by phone, or through the IRS2Go app, according to its estimated tax guidance.

8. What happens if you do not review on time?

If you do not review on time, several things can happen. You may pay less than needed. You may pay late. You may lose deductions because you cannot find receipts. You may discover your income increased, but you did not set money aside for taxes.

The U.S. tax system generally works under a “pay as you go” concept. That means taxes are paid throughout the year as income is earned, either through withholding or estimated tax payments.

Important: waiting until tax season can become expensive.
The goal is not to scare you. The goal is to help you avoid surprises. A business with clear numbers makes better decisions.

9. August is an opportunity, not a burden

Many business owners see taxes as pressure. But August can be an opportunity to regain control.
When you review your numbers in August, you can:

  • understand whether your business is growing;
  • detect disorganized expenses;
  • find receipts before they disappear;
  • correct classifications;
  • plan for the September payment;
  • avoid rushed decisions;
  • reach year-end with more clarity.

You do not need to wait for an IRS letter to get organized. You do not need to wait until December to ask whether your business was profitable.
Pay attention: the best time to correct a problem is before it becomes a problem.

Conclusion: August is the month to prepare

August should not be ignored. For self-employed people and business owners, it is a strategic month to review income, expenses, receipts, previous estimated payments, and cash flow before the September estimated tax payment.

If you are a contractor, restaurant owner, beauty entrepreneur, LLC owner, cleaning business, landscaping company, or construction business, this is a good time to review your numbers calmly.

At Grupo Contable, we can help you organize your information, review your receipts, and prepare better for the next estimated tax payment.

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