Reference · 21 tools · reviewed 25 August 2026
Buyer tools
Seventeen reference tools and four calculators. None of them asks for your phone number, none of them holds a result back, and each one carries the same thing on its face: a plain statement of what it cannot tell you. That line is not a disclaimer at the bottom — it is printed here, on the index, before you have clicked anything.
The RERA decoder and the jurisdiction finder were last reviewed on ; the duty, tax, area and civic-record tools on ; the six finance tools on . Administrative facts move by notification, so a review date is part of the answer.
The instruments
Built for this corridor
The register and the map
Both answer a question the corridor gets wrong constantly, and both refuse to answer the question next to it that they are not entitled to.
Pure string parsing · nothing typed leaves the browser
RERA registration number decoder
Paste a K-RERA or TNRERA registration number and read what each field is: which are transcribed, which can be checked against a certificate, which were derived from the regulator's own register, and which have no published key at all.
What it does not do
It does not check that the registration exists, and it cannot tell you whether one is current. Nothing on the page contacts a regulator. A well-formed number can be entirely invented — which is precisely why the register exists.
Sources cited per row · gaps named
Jurisdiction finder
Which state, district, taluk, hobli, registering office, regulator and planning authority apply to a locality on the corridor — 5 localities, every row carrying the government page it was read off.
What it does not do
It covers only what could be verified from a government source, which is a short list and says so. Where a row could not be sourced it says 'not verified' and names the office that can answer, including every Karnataka civic-body row.
What it costs to transact
Duty, tax and the buyer's own obligation
Five pages on the charges that land on a property purchase, and one rule holding all of them together: a figure written into the body of an Act is quoted with its section; a figure fixed by notification, rule, schedule or Finance Act is named with its authority and linked, never printed.
Stamp duty & registration: Karnataka
Who sets Karnataka's stamp duty and registration fee, which Act charges it, where the current figure is published, what value it is computed on, who owes it and what proves it was paid.
What it does not do
It prints no percentage. The figure moves by notification, so the page names the Karnataka Department of Stamps and Registration and links its portal rather than quoting a number that can go stale between two site visits.
Stamp duty & registration: Tamil Nadu
The same six questions for the Tamil Nadu side of the corridor, with the Registration Department named as the body that publishes guideline value and administers the charge.
What it does not do
It prints no percentage and no guideline value. It also marks, rather than guesses, whether the Tamil Nadu Stamp Act, 2019 has been brought into force in place of the older enactment — the largest open question in the set.
Karnataka vs Tamil Nadu, side by side
What actually changes when a purchase crosses the state line: the Act, the department, the portal, the valuation regime, the land records and the regulator.
What it does not do
It compares regimes, not costs. With no rate on either side there is no cheaper side, and the page declines to imply one.
GST on an under-construction home
When GST applies to a home purchase and when the Act places the transaction outside the tax altogether, what it is charged on, who owes it to the government and what proves payment.
What it does not do
No rate, no deemed land-value fraction. Both sit in a rate notification rather than in the body of the Act, so the page sends you to the CBIC and the GST portal for the figure in force.
TDS under section 194-IA, and Form 26QB
The obligation that lands on the BUYER, not the seller: what section 194-IA of the Income-tax Act, 1961 requires, what Form 26QB is, when it is filed and what certificate proves it.
What it does not do
No rate and no threshold. The page names the Income Tax Department and its portal, and says plainly that many guides still point at an older filing address we have not re-checked.
What the paper says you are buying
Area, dimensions, khata and the taxing body
Four pages about the measurements and the municipal records a purchase is described in. Each of them converts, classifies or locates — and each one stops at the point where only a document or an authority can answer.
Carpet to super built-up area
Converts between carpet area and super built-up area on a loading factor you supply, with section 2(k) of the Act quoted for the one term a statute actually defines.
What it does not do
It publishes no loading factor for any SUYUG project, because none exists in the project data. It converts none of our own published areas either — the data records no basis for them, and that absence is the worked example.
Plot size and dimensions
Converts a plot area between 5 units — square feet, square metres, cents, guntha and acres — and shows what a plot's frontage and depth decide about what can be built on it.
What it does not do
It takes no view on what any authority will sanction. It also runs its own published dimensions against their published areas at render time and reports the row that does not multiply out, rather than dropping it.
Khata type identifier
Tells an A-Khata, a B-Khata, an e-Khata and a grama panchayat record apart by what is printed on the document, and states what each one does and does not prove.
What it does not do
It names no municipal e-khata portal address, because the two candidates returned a certificate chain we could not verify. It reads a document; it does not decide a property's status.
Property tax authority finder
Which class of body levies property tax on each side of the corridor after Bengaluru's 2025 civic reorganisation, and how the Tamil Nadu side differs. Sourced rows only.
What it does not do
It names no city corporation for any address. The delimitation notification could not be read from a government source, so the levying body at Sompura Gate, Sarjapura, Belathur and Bagalur is marked 'not verified' rather than guessed.
What it costs to borrow, and to wait
Six tools for the money side
Meant to be used together: an instalment is only half a decision until you have seen the schedule behind it, what a prepayment does to it, and what an under-construction purchase costs while it is being built. Not one of them stores a rate — no published lending rate stays current, so each asks you for yours and publishes none of its own.
Amortisation schedule
Builds the full month-by-month schedule from a principal, a rate and a tenure you enter — every instalment split into interest and principal, with the year-by-year summary and the month the instalment stops being mostly interest.
What it does not do
It publishes no rate. The one it runs on is the one you typed, not one any lender has offered you, and nothing on the page is a quote, a sanction or an approval.
Prepayment calculator
Shows what a lump sum, or a permanently higher instalment, takes off the tenure and off the total interest of a loan you describe.
What it does not do
It takes no view on whether prepaying is the right use of the money, and it knows nothing about your lender's prepayment terms — those are in your loan agreement, and floating and fixed-rate loans are not treated alike in law.
Affordability calculator
Works out what an income, existing obligations and a tenure imply for a loan amount and a price, and shows the arithmetic rather than just the answer.
What it does not do
It is not a lending decision and prints no loan-to-value cap. Every lender applies its own policy and the regulator's norms on top of arithmetic like this, and either can override the result entirely.
Pre-EMI vs full EMI
What the two actually mean on an under-construction home, run against a tranche schedule you enter: what each path costs in total, and what it costs each month while the building goes up.
What it does not do
It publishes no possession date and no construction timeline. The tranche dates are the ones you type from your own agreement, and the page has no opinion on whether they will be met.
Construction-linked payment planner
Maps a stage-linked payment schedule onto your own agreement value, stage by stage, and tests the first demand against section 13(1) of the RERA Act, 2016.
What it does not do
It is not your builder's schedule. The stages and percentages are the ones you enter from your own agreement, and only the registered agreement for sale binds anybody.
Two quotes on one area basis
Puts two quotes onto the same area basis so the prices can be compared at all — carpet, built-up and super built-up are three different denominators, and a comparison across them is arithmetic on nothing.
What it does not do
It publishes no price per square foot of its own, for any project or any locality. Both quotes are yours; the page only makes them commensurable.
Arithmetic
Four calculators
Each runs on first paint, with no email box and no 'see your result' wall. Every assumption in them is one you set and can change — none is a rate anybody has offered you. The fourth holds no rate at all: it converts a measure, not money.
EMI calculator
Runs an amortisation schedule from a loan amount, a rate and a tenure you set, and draws the month the instalment stops being mostly interest.
What it does not do
The rate is a figure you type, not one any lender has offered you. Nothing on that page is a quote, an approval or a SUYUG offer.
Return calculator
Holds two scenarios you enter against each other so the assumptions behind them are visible.
What it does not do
It publishes no appreciation rate, no rental yield and no forecast of its own. Every growth figure in it is one you supplied, and the output is arithmetic on your assumption rather than a prediction.
Down payment planner
Runs a savings runway forward from what you can set aside each month until the target exists.
What it does not do
It is not a lending decision and takes no view on what you can borrow. Loan-to-value limits are the lender's and the regulator's, not this page's.
Guntha to square feet converter
Converts a land extent between guntha, square feet, square metres and acres in either direction, carries the 1,089 sq ft figure out to a full 1–40 guntha table, and splits any figure back into the acres-and-guntha pair a revenue record actually writes.
What it does not do
It does not verify an extent, and it is not an area basis for a home. Guntha measures land; carpet area is defined by statute and is a different quantity entirely, so no conversion connects the two.
No calculator on this site prints a stamp-duty rate, a registration-fee rate, a GST rate or a loan-to-value cap. Those are set by notification and change without warning — the department that publishes each one is named and linked on the pages that would otherwise be tempted to quote it.
Not tools, but the same discipline
Where the underlying facts live
A tool is only as good as the register behind it. These pages are that register — and the tools above link into them rather than repeating them.
The position
Why these pages print no rate
It is the one rule that decides what the duty, GST and TDS pages are allowed to say, so it is written here once rather than restated on each of them.
Every figure on this subject is set by a notification, a rule, a schedule or a Finance Act, and each of those is amended without warning you. The duty on a conveyance, the registration fee, the rate on an under-construction home, the rate and threshold a buyer withholds under section 194-IA — none of them is a fact about the world. Each is a fact about what somebody published last.
A web page that prints one of those numbers is a snapshot with no expiry date on it. It cannot know when the notification changed, so it goes on stating the old figure with exactly the confidence it had on the day it was written — to you, and to the answer engines that quote it. That is what happens to every page in this subject that prints a rate, including the ones that were right when they were published.
So these pages print none. What they give you instead is the part that does not go stale: which authority sets the figure, where that authority publishes the current one, what the figure is charged on, who owes it, when it falls due, and which document proves it was paid. Take the number from the authority. Take the structure from here.
What is not on any of those pages
- No stamp duty percentage, for either state.
- No registration fee percentage, for either state.
- No GST rate, and no deemed value fraction from the rate notification.
- No guidance value and no guideline value — not a figure, not a range, not an example.
- No rate, threshold or penalty amount under section 194-IA.
- No rupees per square foot, and no worked total that would imply one.
- No completion or handover date, on any project, anywhere on this site.
The same standard the rest of this site works to. Our glossary defines these terms without printing a figure for any of them either.
A number in the body of an Act is quoted, with its section. You can check it against the bare Act in a minute, which is the same standard this site's glossary applies to statutory definitions. There are very few such numbers on these pages — the period the Registration Act, 1908 allows for presenting a document, in section 23, is the clearest of them.
A number fixed by notification, rule, schedule or Finance Act is named, not printed. Every rate on this subject is in that class. The authority that publishes the current one is named and linked instead, on every answer that would otherwise be tempted to quote it.
A section number we did not transcribe is marked, not guessed. Where the Act is certain and the section was not checked against the bare Act, the Act is cited and the section carries a visible mark. A confident-looking citation nobody verified is worse than an admitted gap, because a reader cannot tell the two apart.
Nothing here is advice, and none of it is specific to your transaction. These pages describe a general structure. What you owe depends on your document, your residence status, the parties and the property, and that is a conversation with your own advocate and your own chartered accountant — neither of whom is us.
The standard
The rules every tool on this site follows
No gate. No email box, no phone field, no result held back until you identify yourself. A tool that withholds its output is an advertisement wearing a tool's clothes.
No rate we cannot stand behind. No stamp duty percentage, no registration charge, no GST rate, no interest rate, no loan-to-value cap, no price per square foot. Each is set by an authority that publishes it; we name and link that authority instead.
Every derived fact carries its counts. Where a reading was worked out by reading a public register rather than from a published key, the page prints how many rows were read, on what date, and where the reading is not clean.
A gap is stated, not filled. 'Not verified' is a real answer and it appears on these pages, with the office that can answer it named. The alternative — a plausible sentence with nothing behind it — costs a reference page the only thing it has.
No verdict badges. Nothing here prints 'verified', 'active' or 'approved'. A badge is computed on the day the page was built and is wrong the morning after it goes stale. We print the dated facts and let you do the comparing.
If a tool here is wrong
Tell us and we will fix it or take it down. Everything on these pages is either transcribed from a document, derived from a public register with its method shown, or marked as unverified — which means every error on them is findable, and a page whose errors are findable is worth more than one whose are not.