Quarterly Tax Calculator
REMOTE · MCP.QUARTERLYTAX.AL157.XYZ
US federal + state quarterly estimated tax estimates, SE tax, and quarterly payment due dates.
Available components
Last scanned (18 hours ago)
Scores higher than 58% of remote servers
Reachable. Last reached 18 Oct 2026.
Category Finance and Payments
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security63
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement. View diagnostics → Unverified
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability82
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 286 tokens (~143/item across 2 items; 2 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management10
- Stability observed for 3 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 2 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 2 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 18 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.
- 16 Oct 26 +1
- Stability: unverified → 0.03 ▲ functional
- 15 Oct 26 66
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 18 Oct 2026 · Probed https://mcp.quarterlytax.al157.xyz/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=al157.xyz | CN=WE1,O=Google Trust Services,C=US | 15 Oct 2026 | 13 Jan 2027 | ECDSA 256 | ECDSA-SHA256 | 5466c51577801fd10e9dc9d4ac069c56 |
| SANs: al157.xyz, mcp.quarterlytax.al157.xyz, *.mcp.quarterlytax.al157.xyz | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of mcp.quarterlytax.al157.xyz. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| xyz. | present | 3599, 18130 | 8, 8 | Verified |
| al157.xyz. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://mcp.quarterlytax.al157.xyz/mcp | Verified | 200 | |
| http (plaintext) | http://mcp.quarterlytax.al157.xyz/mcp | Inconclusive | 405 |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
estimateQuarterlyTax ~207
Estimate US federal + state quarterly estimated tax payments for a self-employed person. Given annual Schedule C net profit, filing status, two-letter US state code, tax year, and whether the §199A QBI deduction applies, returns annual federal income+SE tax, rough state income tax, SE tax, combined total, the per-quarter installment amount (4 equal payments), and a deep link that opens the site calculator pre-filled with these inputs. Read-only calculation; no data is stored.
| Name | Type | Req | Description |
|---|---|---|---|
| filingStatus | string | yes | Federal filing status: single, mfj (married filing jointly), hoh (head of household). |
| includeQBI | boolean | – | Whether the §199A qualified business income deduction applies (default true). |
| netProfit | number | yes | Annual self-employment net profit in USD. |
| state | string | yes | Two-letter US state code, e.g. "CA". |
| taxYear | integer | yes | Tax year for the federal rules applied. |
No output schema declared.
No examples provided.
getPaymentCalendar ~79
Return the 4 federal quarterly estimated tax payment due dates for a tax year (Apr/Jun/Sep 15 and Jan 15 of the following year, rolled forward past weekends and IRS holidays to the real deadline), plus a deep link to the site. Read-only.
| Name | Type | Req | Description |
|---|---|---|---|
| taxYear | integer | yes | Tax year whose installment deadlines to return. |
No output schema declared.
No examples provided.
How do I install the Quarterly Tax Calculator MCP server?
Quarterly Tax Calculator is a hosted endpoint at https://mcp.quarterlytax.al157.xyz/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · mcp.quarterlytax.al157.xyz
claude mcp add --transport http al157-quarterlytax-mcp 'https://mcp.quarterlytax.al157.xyz/mcp'
What is the Quarterly Tax Calculator MCP server?
Quarterly Tax Calculator is an MCP server listed in the public MCP registry as io.github.al157/quarterlytax-mcp. US federal + state quarterly estimated tax estimates, SE tax, and quarterly payment due dates. This page covers its hosted endpoint (https://mcp.quarterlytax.al157.xyz/mcp).
Is the Quarterly Tax Calculator MCP server safe to use?
Quarterly Tax Calculator scores 68 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Quarterly Tax Calculator MCP server expose?
Quarterly Tax Calculator exposes 2 tools: estimateQuarterlyTax, getPaymentCalendar. Their descriptions and schemas cost roughly 286 tokens of context every time the server is loaded.
Does the Quarterly Tax Calculator MCP server require authentication?
No. We connected to Quarterly Tax Calculator without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Quarterly Tax Calculator MCP server still maintained?
Quarterly Tax Calculator is still listed as active in the MCP registry. We last reached this channel on 18 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.