How Much Is Telstra Really Costing Your Small Business? A Line-by-Line Breakdown

Most small businesses on a traditional Telstra setup have never sat down and added up what they actually pay for phone services each month. The charges are spread across multiple invoices, some are bundled into plans, and others are quietly added as "standard fees." When you do the maths, the total is often a surprise -- and not a pleasant one. This guide adds it all up, line by line, then shows what the same capability costs on a modern cloud phone system.

A Typical Telstra Business Phone Setup for a Five-Person Office

Let's use a realistic small business scenario: a five-person office, one main business number, one 1300 number for customers, a basic call plan, and handsets leased through Telstra. This is a common configuration for a small professional services firm, trade business, or retail operation.

All prices below are in Australian dollars including GST. These are indicative figures based on publicly available Telstra business plan information and are meant to illustrate the structure of costs, not to quote live pricing (which changes regularly).

The Line-by-Line Breakdown

The Total: What You're Really Paying

Adding the fixed items only (excluding variable 1300 call costs and contract exit risk):

• Line rental x5: $275-$375/month
• Call plan: $40-$80/month
• 1300 monthly access: $30-$50/month
• Handset rental x5: $40-$75/month
• Connection fee (amortised): $10-$20/month
• Paper billing: $2-$5/month

Total fixed monthly spend: approximately $397-$605 per month.
That's $4,764-$7,260 per year -- before 1300 inbound call charges.

Over three years (a typical Telstra business contract term): $14,292-$21,780.

The Same Setup on a Modern Cloud Phone System

Now let's look at the equivalent capability on a cloud-based business phone system. Same five users, same main business number, same 1300 number, same call volume.

The Comparison: Side by Side

What You Gain by Switching (That Telstra Charges Extra For)

The cost comparison above only tells part of the story. The other part is what you get -- and what Telstra charges extra for, if it's available at all on a standard business plan.

Ring groups (hunt groups) -- if your main number isn't answered within three rings, the call automatically rings the next available person. Included in most cloud systems. On a traditional Telstra setup, this requires additional configuration and often additional lines.

IVR / auto-attendant -- "Press 1 for sales, 2 for support, 3 for accounts." This requires an additional Telstra service in most configurations. On a cloud system, it's a standard feature you configure yourself in a browser in about ten minutes.

After-hours routing -- sending calls to voicemail after 5pm, or playing a different greeting on weekends, is a basic feature of any cloud phone system. On a traditional setup it often isn't configured at all, which means customers get ringing and silence after business hours.

Voicemail to email -- receiving a voice message as an audio file in your inbox is standard on cloud systems. On traditional setups it's either not available or requires a premium add-on.

Mobile app / softphone -- staff can take calls on their smartphones under the business number, without giving out personal mobile numbers. Included in most cloud plans. Not available on traditional landline setups.

Call recording -- useful for quality assurance, compliance, and training. Available as an add-on or standard feature on cloud systems. Rarely included in traditional setups at small-business prices.

Call reporting -- how many calls came in today? How long did they wait? How many went unanswered? A cloud phone system logs all of this automatically. A traditional Telstra setup has limited or no call reporting at the SMB tier.

For a deeper look at what these features mean in practice and how to evaluate them, see our VoIP cost guide and our hidden costs of VoIP article.

The Hidden Cost Nobody Mentions: The Contract

Traditional business phone contracts are typically 24-36 months. Exit fees are real and substantial -- often calculated as the remaining months multiplied by the monthly plan cost. For a business 12 months into a 24-month contract at $500/month, the exit fee could be $6,000 or more.

Most cloud phone systems are month-to-month, or at most 12 months with a simple cancellation notice period. Some offer no contracts at all. The flexibility difference is significant for a small business that may need to scale up, downsize, or change direction quickly.

Under Australian Consumer Law, there are minimum rights around unfair contract terms in small business contracts. If your Telstra contract was signed before you fully understood the exit fee structure, it's worth reading the terms carefully. The Australian Competition and Consumer Commission (ACCC) has information on small business contract protections at accc.gov.au.

What Most Businesses Get Wrong

Mistake 1: Comparing the plan price, not the total cost. A Telstra plan that's advertised as "$89/month" might actually cost $500/month once line rental, 1300 access, handset rental, and call charges are added. Always calculate the total cost, including every line item on the invoice.

Mistake 2: Assuming switching is complicated or risky. Number porting in Australia is a regulated process. Your business number can be transferred to a new system without downtime in most cases. The process is well-established and takes 5-10 business days. See our number porting guide for a step-by-step walkthrough.

Mistake 3: Renewing without reviewing. Many businesses reach the end of a contract period, get a renewal offer, and sign again without comparing alternatives. The renewal is convenient and feels low-risk. But the market has changed significantly in the past three years, and the cost difference is now substantial enough that it's always worth doing the comparison before renewing.

Your Next Steps

• Pull your last three Telstra invoices and add up every line item. The total is your current baseline.
• Note your contract end date. If you're within 3 months of the end, now is the time to act. If you're mid-contract, calculate the exit fee and factor it into the comparison.
• Use the VoIP Cost Calculator to estimate what the equivalent capability costs on a cloud system.
• Check your internet connection with the VoIP Bandwidth Calculator to confirm your NBN plan can handle business VoIP calls.
• Work out what you need with the Phone System Sizing Wizard -- lines, extensions, features.
• Get a recommendation -- once you know your numbers, we can match you to the right provider for your size, budget, and call pattern.

For more on the full cost picture of switching to VoIP, including the costs people don't usually mention, read our phone system total cost of ownership guide.

Can I keep my Telstra business number if I switch to a different provider?

Yes. Phone number portability is regulated in Australia by ACMA. Your business number belongs to you, not to Telstra, and can be transferred to any compatible VoIP service. The process takes 5-10 business days and the new provider manages it on your behalf. In most cases, your existing service stays active until the moment the port completes, so there's no gap in service.

What happens if I'm still in a Telstra contract?

Check your contract for the exit fee clause -- it's usually expressed as the remaining months multiplied by the monthly plan charge. Compare that exit fee against the total savings you'd achieve by switching now rather than waiting. In many cases, the first-year savings on a cloud system exceed the exit fee, making it financially worthwhile to exit early. It depends on your specific contract terms and how far through the term you are.

Are 1300 numbers more expensive on traditional phone systems?

Yes, typically. On a traditional setup, the 1300 number access fee is higher, and inbound call charges per minute are usually higher than on a cloud system. This is because the infrastructure costs are higher for traditional PSTN-era 1300 routing. Cloud-based systems route 1300 calls over VoIP, which is cheaper to operate, and that saving is usually passed on. If your business receives a high volume of 1300 inbound calls, this cost difference alone can be significant.

Do cloud phone systems require different handsets?

If you want to use physical desk phones, yes -- a cloud VoIP system uses IP phones that connect via ethernet, not standard analogue handsets. These are different from the phones that plug into the back of a Telstra socket. However, many businesses start with the smartphone app (which is usually included) and add desk phones later. If you're replacing existing handsets anyway, the cost is one-time rather than ongoing rental.

Is VoIP call quality as good as a Telstra landline?

On a stable NBN connection, VoIP call quality is equal to or better than a traditional landline. The variables are your internet connection speed, consistency, and the VoIP provider's network quality. On a poor or congested connection (particularly some FTTN NBN services with variable upload), call quality can suffer. Our Bandwidth Calculator can tell you whether your connection is suitable before you commit to anything.

Does switching mean I have to change my internet plan too?

No. Your internet plan and your phone service are completely separate in a modern VoIP setup. You keep your NBN connection from whatever provider you use now. You add a business VoIP service on top of it from a specialist provider. The two services run independently. Upgrading your phone system does not affect your internet plan.