Summ (formerly Crypto Tax Calculator) Reviews 755

Be aware, if you have staking on coinbase they count EVERY SINGLE ONE of these daily rewards as a transaction which puts you above most plans forcing you to the higher plan of £149 or £249.

Look else where.

Easy to use, have used it for two financial reports to send to the auditor for a SMSF crypto portfolio.

I was not sure of the rules and what to include.
Saved me time and a lot less grief.
Money well spent

Impossible to speak to a human. I cancelled my subscription and sent multiple emails to support to ensure that they would not debit my account but they are still trying. I only get AI responses to the emails. Ridiculous!!!

Honestly, I would have been lost without it. Solves nearly every transaction by itself and those that dont are flagged for review. Detailed accountant level reports and more, works great.

Clear instructions. Responded quickly and made it easy. Thank you CTC

once set up it does the hard work for you and i just send it to my accountant and its easy peezy

Will not allow me to cancel my account. I cannot login, no password reset arrives, and states no account is associated with my email. Yet they then bill me $249 against that email. Absolute rip-off. Recommend not using.

At first I thought this was way too complicated so tried another site on a free trial.

After finding that site not as efficient as CTC, I returned and persevered, despite encountering numerous issues that were confusing for my aged brain.

I’ve had assistance from several operators, most recently Karl and Arjay who were very helpful and patient in helping me to resolve the relatively simple issue I was facing and their replies were timely and professional.

In so doing, they helped me to better understand the nuances of CTC which initially had seemed overly complex.

Hence, I now feel more confident in using this software and know that, if required, I will receive very timely and knowledgeable assistance.

It's really easy to use, especially if you have accounts on multiple CEX and multiple defi wallets.
Creating a spreadsheet to work all of this out would be way more effort.

I'd say at first, it might take a few weeks, to maybe a month or two, depending how complex your transactions are, but once you get the hang of it, it's pretty easy.

I've been using for 4 years, and I have a lot of transactions, so I need to pay the investor package, which is $249 AUD a year. (You can also claim it on tax).

Other than the price, everything is great.

The support helps you out with a lot of issues and are pretty fast to reply.

I've used other calculators, but the simplicity of CTC is far superior, and their support is more responsive.

In short, I would not have been able to claim my crypto tax loss (I had to sell my crypto due to a major event) without CTC. It was a big loss unfortunately, but that meant I was due a very large refund.

I had attempted to claim the loss with, what I felt was, decent enough records of initial purchase and ultimate sale. The IRD rejected my claim, seemingly mainly because Binance now voluntarily sends all NZ user info to the IRD. Therefore the IRD knew there had been a bunch of transactions between the initial purchase and ultimate sale. To my dismay they wanted every single transaction itemized. I went back and forth with them about how undoable that was, but they wouldn't budge and said to try using a tax calculator.
We're talking nearly 2,500 transactions across numerous wallets, 4+ exchanges including pancake swap, uniswap. Honestly the mountain was insurmountable, and I could see the refund I was entitled to at real risk.

I did a bit of research and ended up using CTC. What I liked was being able to use the software first, before paying for it. So I started plugging all my wallets into it, some needed uploading in CSV format, with a bit of manual effort. There was a lot of manual effort required in my case, but also a lot of automation that helped immensely. Basically the software gave me a starting point and path to sorting everything out. I actually did most of the work before paying for the software. All up I spent 3+ full days solely dedicated to working through my crypto tax.

I used the in-built chat assistant which was helpful, and a man called Alvin when the automated assistant couldn't help. Alvin was a real help. If you apply yourself you can sort the vast majority of things out without help, just using their guides and generally researching. That was what I found anyway, but a relief to get through to a real person when you have some real curly issues.

I purposefully did not submit a review until the IRD approved the loss. They have now done so, so I can say CTC worked extremely well for me.

The software doesn’t work. Use koinly.
It will not take 20 minutes. It simply doesn’t work and can not reconcile a simply buy and sell to name only a couple of issues. When uploading you api or csv it doesn’t read properly. One buy is duplicated 6-7 times and you can’t reconcile it properly. Once uploaded and unable to reconcile you need to delete and re upload to fix the issue. I had to delete and upload 7 times before it was close figures. They blame user error but for example Swyftx ther is only one simple way of doing it. Everytime you re uploading it uses credit. Once you run out you get your report that’s blocked out unable to read numbers unless you spend more on upgrading the account. Its calculations for me were hundreds of thousands of dollars off. One wallet showed I had thousands in multiple wallets that don’t exist. Another wallet that had 10s of thousands but showed showed nearly a million dollars once uploaded- Not even close. Use at your own risk.
The team are responsive but don’t have any knowledge to help. Stating - we are not accountants and don’t have the knowledge to help with the reconciliation process. They know the basics which doesn’t help fix the massive issue with the software.

I'm a power user with 40+ wallets across 20+ chains and it would be impossible for me to correctly calculate my taxes without CTC. Amazing tool that keeps getting better.

Overall I was happy with the product and used it to submit last years tax, the support was excellent and I was in love with the product.

That was then, today after weeks of trying to get help on being unable to submit this years tax I am starting to stress.

I am unable to make any changes to any transactions. I've opened a ticket with support and been told my issue is only affecting a small number of customers so it has a low priority

Just to be clear, I cannot change any transaction, I cannot edit them, I cannot make changes, basically the platform is 100% unusable and Ive been told this isn't a priority. I've paid $400 and I cannot use the platform. I've been instructed to duplicate every problem transaction, so ALL of them and edit those, I have said this wont be happening as I wont be creating myself a bigger issue and they need to fix this bug.

They cannot be serious this is a bug, the platform cannot be used, thats not a bug, thats a major failure of the product.

Im really stressed and worried I cannot submit my tax hence this review, 3 weeks ago I'd have written a positive review.

The developers need to get their act together and fix this issue and make it their number 1 priority regardless of it being 1 customer or 10, its unacceptable

UPDATE 1st September 2025

Still no progress with support and no fix, I’m still unable to edit transactions or submit my tax and apparently I’m not the only one. I’d suggest looking elsewhere until they can fix the issues they have or you could be stuck like me out of pocket with an unusable product

Great programme and fantastic support. Highly recommend this easy to use tax calculator

Waw bast app to use

Crypto Tax Calculator AU is a fantastic tool for managing crypto taxes, especially once you get the hang of it! The platform makes it easy to import transactions, reconcile discrepancies, and generate ATO-compliant reports. Features like the Grouping Assistant and CTC Magic are lifesavers for fixing issues like missing transfers. It took a bit of learning to navigate, but the support team and intuitive interface made it worthwhile. Highly recommend for anyone tackling crypto taxes in Australia

Very impressed with the software and the attention given by Arjay in Customer Service. After 3 years with thousands of transactions per year, the exchanges tax reports weren’t cutting it. After researching tax software for crypto, I decided to try CTC. With the number of transactions I had, it was the most cost effective software I found and had good reviews.

I had a few issues for a start with missing information, uncategorized transactions, and missing purchase history. I found it a little annoying to get past the customer service Bot, but once I had human support and worked with Arjay, it was easy to sort out the issues. By changing from API to CSVs to upload the transaction history we solved the missing data issues and although it took a bit of time to sort through everything, the patience and knowledge Arjay showed while assisting me to solve the uncategorized transactions and missing purchase history was greatly appreciated.

While it is a bit of a learning curve to use the software, I feel it is very worthwhile, and you can see immediately where you are with your investments.

This platform just cant be trusted with something as important as taxes so it seems.. Honestly, so disappointed and frustrated with this company and its software.. I'm continiously finding errors with the info. Incorrect or missing purchase prices/cost base.. Not integrating particular assets.. Not piecing transfers together properly.. The list goes on.. I've purchased the "Investor" package.. & the amount of time i'm having to spend troubleshooting errors has become asuch a headache. The software isn't very intuitive forcing you to fix up seemingly obvious errors in info not integrating/correlating properly.. Not too mention spending hours figuring out the ins and outs of the platform because you have to troubleshoot stupid errors constantly. I purchased this software in the hope it was going to make life easier buts its proving to be quite the opposite, overly complicated & incredibly time consuming. & Support isnt much help. You have to wait 24hrs+ to get a response and half the time drawing out the process to the point it takes a week or so to resolve an issue. & half the time they'll close the chat on you if you dont respond back to them within a certain time frame! You guys are charging a small fortune for this service, crypto & tax can be overwhelming as it is and this aint helping the cause. Really should have a team on deck ready to assist in real time, especially during business hours. This is becoming beyond a joke.